Showing posts with label model. Show all posts
Showing posts with label model. Show all posts

Thursday, 12 September 2013

Is Dudley council setting out a new model for dementia care?

Older woman getting on a bus Dudley's initiative aims to help people with dementia stay independent for as long as possible. Photograph: David Levene for the Guardian

One of the most pressing problems for local authorities and the new clinical commissioning groups (CCGs) is how to provide services to people in their areas diagnosed with dementia. As the ageing population imposes even greater demands on health and social care services, a local authority in the Midlands has developed its own strategy for dementia that brings services together to support people at home.

The dementia gateway service developed by Dudley metropolitan borough council (DMBC) has been operating since November 2011 and aims to integrate early diagnosis and medical intervention for people with dementia with social care to keep the person independent and in their own home for as long as possible.

The care pathway is based on a multidisciplinary team approach, involving initial assessment by dementia nurses, with input from old age psychiatrists, mental health specialists, and dementia advisers, all of whom were part of the steering group that devised the pathway.

Matt Bowsher, assistant director, quality and commissioning at DMBC, says: "We wanted to develop a person-centred approach to dementia care based on listening to our clients and responding to their needs, and to help people avoid having premature links with 'serviceland' for as long as possible. We needed to adapt services to the needs of clients and their families rather than have a rigid system which delivered the same service to all clients."

The council estimates that it will have around 4,365 people diagnosed with dementia by 2015, but this is predicted to rise by 50% to 6,435 by 2030. There are currently around 58,200 people aged over 65 in its population of 312,000.

The government's strategy for personalisation of social care, "Making it Real", launched in 2009, prompted the council to review the way it provided dementia care and led to the setting of the steering group. Last year, prime minister David Cameron set a Dementia Challenge for councils to improve their services to local people.

"We now support high numbers of people, including some of working age, to live well with dementia at home by providing information and advice and making links to universal services so that people can still pursue their personal interests and hobbies through our adult community enablement team," says Bowsher.

The council has a dementia adviser linked into acute hospital services, who liaises with the early supported discharge team. The adviser links with the person and their relatives within a day or two of their admission to hospital, liaises with ward staff and supports an inpatient clinic. This setup enables the NHS to achieve its CQUIN targets.

The gateway offers therapeutic and creative activities to clients, and short and long-term respite to carers, as well as interventions to people living with dementia, which maintain or build on their skill levels while also reducing the need for drug therapy or early admission to residential or nursing home care. The council also works in an integrated way with its own adult social commissioners and the CCG commissioners to ensure that services are co-ordinated.

"We originally had only one dementia nurse specialist, but we now have three," says Annette Darby, dementia services manager at DMBC. "There are now three ways that clients can be progressed through the system: through GP referral to our nurse specialists, through community mental health nurses and through social workers. Our dementia advisors are also being trained to undertake the assessment of need – technically known as an MAF1/MAF2/Support Plan – to deal with presenting issues."

The CCG was involved in the service from the outset (formerly as the PCT) and believes the pathway has been very successful. Paul Maubach, the CCG's chief accountable officer, says: "We think the service is a really good example of collaboration between local authority and CCG. Dudley was in the bottom third of detection and diagnosis rates for England, and there was actually a reluctance for some GPs to diagnosis patients with dementia, because they did not feel there were adequate support services in place. Now that's changed and the gateway service has diagnosed around 400 cases in the last two years. We have a much higher rate of referral to services now and a clear pathway for patients."

He also says that the three dementia centres run by the service provide a valuable focal point for treatment and support for clients and their families. Both the council and the CCG acknowledge the crucial role played by the voluntary sector in supporting people who have been diagnosed and their families.

Janice Connolly, the Midlands locality manager for the Alzheimer's Society, says that it offers a range of services in the Dudley area and across the Midlands. "We run around 18 dementia cafes across the Midlands region and four of these are in the Dudley area.

These are monthly sessions where the person diagnosed and their family can meet others in the same situation, and this can help greatly with information-sharing and mutual support. We also run a helpline for crisis support and give advice on accessing social and domiciliary care."

The service has now gained national recognition, winning praise from health minister Norman Lamb at a recent conference and even from health secretary Jeremy Hunt. The NHS director general of social care has also paid a visit to Dudley in recent weeks to see first-hand how the service works.

As councils struggle to find resources for improving dementia care, the Dudley model could prove to be a blueprint for the future around the country.

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View the original article here

Monday, 9 September 2013

The Fundamental Danger To Biotech And How pSivida's Model Can Help Address It

The biotech industry is fundamentally different from nearly every other industry in the economy. The way biotech is structured affects the way we write about it, analyze it, and invest in it. Those who make it their business to know more than just the basics of what's going on should ask themselves these questions: For any given new drug in the pipeline, how important is price versus safety and efficacy? Is a low price for a new drug even a good thing, or would investors, paradoxically, prefer to see a more expensive drug hit the market?

In almost every other industry, companies compete with one another to produce the best products at the lowest possible price. This is what free market capitalism is all about. Companies competing with one another to satisfy consumers' desires in the cheapest way possible is the very thing that raises our standard of living. It's why the average lower middle class working stiff leads a much more physically comfortable life than any medieval nobleman.

Generally, when two competing companies come out with similar products, investors ask themselves who will undercut whom, how much will the new product cost? Who will offer the cheaper product of a given quality, and may the best entrepreneur win.

This isn't really the case with biotech. While it certainly does not apply in every case and there are of course price limits, there is a clear tendency in biotech to applaud high price tags. To cheer for example when a new cancer drug comes out that will cost patients $10,000 a treatment (as the much hyped and famed Kyprolis costs), not to worry too much about competitors that may come in and undercut that price. That is a concern, but only secondarily, and usually only if a new drug is wildly expensive even for insurance companies. The primary concerns are always FDA approval followed by getting the medical community acquainted with the new treatment so doctors can start billing insurance companies. Price doesn't seem to factor all that much into the equation. We assume that the price will by definition be paid by the consumers regardless and then we start calculating in our heads how many prescriptions it will take for revenues to reach the $1B mark, which is why people are happier if the drug costs $10,000 instead of, say, $8,000. How and why is this the case with biotech?

Mandatory Insurance Warps Demand, Market Exclusivity Warps Supply

The problem with biotech, as it always is with prices, is supply and demand. Both are heavily warped by forces exterior to the market, and this creates a systemic danger to the entire biotech industry, a danger which I will explain shortly.

On the Demand Side

It is natural for the price of life-saving drugs to be much higher than other goods because, all other things being equal, the demand for life is much higher than the demand for any other good. But the amount of GDP being spent on healthcare is rising every year, and that cannot be explained by a snapshot demand curve in time.

According to Aetna, healthcare spending was $2.6T in 2010. That is 17.4% of total nominal 2010 GDP. In 1970, it was $75B, 7% of the total that year. That's 2.5x more health care spending per capita in 40 years. Either Americans are using 2.5x more healthcare services per capita than they were 40 years ago, or health care is 2.5x more expensive. The ugly truth is both. And the even uglier truth is that these two factors feed off each other in a positive feedback loop of higher usage/higher cost.

What are the extra market forces causing this money vacuum feedback loop? On the demand side is mandatory health insurance. The "employer mandate" is not something new to the scene since Obamacare. It has in fact been around since 1951 when the IRS declared employer-based health insurance a tax deductible business expense. The minute you have government taxing one thing for employers but not taxing another thing, demand for the thing not taxed grows beyond what it would have been naturally had employers not been taxed at all. With the added benefit of health insurance expenses becoming a tax shelter, money started crowding into it beyond the necessities of the services the insurance actually provided, and more for the benefit of it being tax deductible. More health insurance please. Additionally, the very fact that the employer is the broker between the insurance company and the healthcare consumer (patient) pushes up demand even further because the consumer does not directly pay for the service, so he cares less about what it costs, as does the employer, because again, every dollar spent is tax deductible for the employer anyway.

After 1951 came Medicare. When Medicare was introduced in the 1960's, demand was even further stimulated. If the government is paying for it, the consumer may as well splurge. It got even more extreme with Bush's Medicare Part D which targeted prescription drug demand specifically. All of this artificial demand has led us to the point where we are today: Only 9.8% of the massive amount of people with health insurance coverage have purchased it directly. The rest have either employer-based or government-sponsored insurance policies. The Obamacare employer mandate will only push demand to even more grotesque heights, as most employers will be actively forced to provide insurance instead of just being passively lured by a tax credit.

To complete the demand side of the picture, the current situation puts the insurance companies in almost complete control. This is not to fault them, because in order to support such a massive clientele liable to overuse the service as they are not directly paying for it, insurance companies need to be able to dictate what prices doctors can charge for just about everything or else lose control of their balance sheets and go under.

In a business where there are so many external non-market forces pushing demand wildly up, it is no wonder that investors cheer higher prices to support that demand. High demand requires higher prices. That's just economic law. And we assume almost any price will be paid by the end consumer. After all, he's covered by insurance he's not even directly paying for, be it government or employer. Bring on the ultra-expensive drugs.

What happens if all insurance is simply rejected? One Dr. Michael Ciampi in Maine decided to do just that in his local practice. As you can see in his price list, prices plummet. Unfortunately, insurance can only be rejected in the case of decentralized doctor services. It cannot be rejected for centralized pharmaceutical goods put out by the biotech industry.

On the Supply Side

When demand goes up, all other things being equal, price goes up. When supply goes down, all other things being equal, price goes even higher. And what is constricting the supply of new drugs? Market exclusivity grants based on patents. I'm not trying to make the case that there should be no patent protection or time-limited exclusivity rights on new drugs. Obviously there should be. I'm just stating what the facts are and the economic consequences of them.

A new molecule drug is patent-protected for 20 years from the moment the patent is issued. Since companies apply for patents during clinical trials and sometimes even before, the number of years the patent lasts on the market varies. Nevertheless, a patent-protected drug has automatically limited supply, being that one company simply decides what that supply will be with competition outlawed. Immediately when a drug goes generic, supply rockets and price drops drastically.

While the main problem is artificially stimulated demand via bloated insurance laws and tax regulations, constricted supply exacerbates the problem. Patent-constricted supply plus heavily stimulated demand equals extremely high prices.

The danger of skyrocketing prices to the biotech industry

Depressions come about when the supply of money in an economy drops suddenly after a protracted expansion. When the supply of money goes up, producers use the money to produce more goods and services. If suddenly the money supply goes down because more people for whatever reason take cash out of the fractional reserve banking system (in our current 10% fractional reserve system the money supply contracts by $10 for every $1 taken out in cash), consumers do not have the amount of money necessary to buy those goods and services at prices that would be profitable for the producers when they were produced at the higher money supply levels. This leads to one of two possibilities:

The producing firm sells their stock of goods and services at drastically lower prices for a loss and the consumers benefit, while the economy readjusts to the new, lower price level with bankruptcies and capital changing handsThe central bank prints more money to reflate the original price level, and everyone shares the pain of inflation and the boom/bust business cycle begins anew

This is what happens every time the money supply expands and then contracts, epicentered in whatever sector the money was mainly going into during the monetary expansion. Last time it was housing. But the artificially stimulated demand for housing is not like that of biotech. There is no insurance company buying houses for people. People buy houses with their own money, or money they borrow from other entities. Either way it's a direct transaction with the end consumer ultimately responsible for the money he used to buy the house. If he doesn't have it, the house goes up for sale cheap and prices start to plummet. The price of prescription drugs, however, can keep going higher even when money supply declines because insurance companies, latched on to the entire economy with an entry point at nearly every employer, can and will keep sucking up all the money needed to support the current pharmaceutical price structure. Again, I am not assigning blame here. Insurance companies need to stay in business, too. This is just what happens when demand and supply are completely out of whack.

But this can only go on for so long. The amount of GDP spent on health care can only go so high before the money simply is simply no longer there to support it, regardless of how many economic entry points insurance companies have to suck it out. No one knows what that point will be, but it's coming. When it does happen, many biotech companies will lose their shirts because the Fed will not be able to reflate again without destroying the currency.

In order to survive, Big Pharma, Specialty Pharma, and Little Pharma will all have to figure out how to lower their costs before they are all forced to do so by the market. A new business model needs to take hold, one that can lower prices even in the face of outrageously distended demand and constricted supply. I believe one company in particular, pSivida, (PSDV) can provide the biotech industry with a good model for how to proceed in lowering costs. What follows is less of a bullish case for the stock per se and more of an analysis of how pSivida's business model works to lower costs while maintaining profits and can and should be adopted by other biotech companies.

How pSivida lowers costs

pSivida's business model is basically to introduce nano-sized machines into the area of ophthalmic drug delivery, increasing effectiveness and, eventually, lowering costs. pSivida develops nano-sized ocular implants that are designed for sustained release of a given drug. It generally partners with other companies by providing the hardware while the partnering company provides the drugs that go into it. pSivida's first ocular drug implants have not been blockbusters, but with every advancement the company addresses a bigger market and could potentially increase the savings from these implants.

Its first product Vitrasert® was approved in 1996 for an obscure eye disease called CMV retinitis, which only occurs in late stage AIDS patients. It is licensed to Bausch and Lomb but royalties to pSivida officially stopped as of March 31. Royalties from Vitrasert have been immaterial for years anyway, as HIV treatments have improved significantly since 1996.

Its next FDA approved product Retisert® was approved in 2005 and licensed also to Bausch and Lomb for the treatment of posterior uveitis, a sight-threatening inflammation of the eye affecting 200,000 people in the US. Retisert is a tiny insert the size of a grain of rice that releases corticosteroids into the eye over a period of two and a half years. Retisert royalty to pSivida amounted to $1.4M (page 38) for 2012, substantially all of its royalties for that year. The rest of its revenues came from collaborative agreements with its partners. Total expenses since 2010 excluding impairment charges have been about $14.5M annually, so royalty from Retisert is not enough. Nevertheless, Retisert was a significant advancement for the company and proved the efficacy of its approach, but since posterior uveitis was generally treated with eyedrops beforehand, Retisert did not serve to lower the costs of treatment, only its efficacy.

pSivida's latest advancement brought to market is Iluvien, licensed to Alimera Sciences (ALIM). Iluvien is an ocular implant designed to treat diabetic macular edema, or DME, also by sustained release of corticosteroids for a period of 3 years. Due to serious side effects including increased ocular pressure, it is only approved for chronic DME patients who have not responded to other therapies, and only in Europe. As for the US, the FDA's decision on Iluvien for chronic DME is expected on October 17 (page 7). Despite pSivida's advances with Iluvien, it is still not cost effective at the proposed price in England. Also, two dozen insurance groups in Germany where most of the revenues are coming from have not yet made a decision to cover its costs. Still, pSivida has been improving its implant technologies, and I believe the cost lowering benefits are still to come, and they will come with Tethadur.

Tethadur would be the holy grail of nano ocular implants. It is basically a nano-silicon sponge with adjustable sized holes depending on what drug and how much of it needs to be released over a given period of time. Tethadur is in preclinical trials testing how insulin as well as Lucentis, Novartis' (NVS) wet AMD treatment, are released by Tethadur. To give you an idea of the sales size of these drugs, Lucentis sales topped $2.4B in 2012. Sanofi's (SNY) insulin drug Lantus reached $5B. We can't say if pSivida is pursuing a partnership with either Sanofi or Novartis with regard to these drugs (I would suspect not for Lantus at least, since insulin is injected in doses way too large for a nano-implant), but pSivida has published three press releases since April involving tech evaluation agreements with three "leading" and "global" pharmaceutical companies involving Tethadur.

Regarding Lucentis for wet AMD, current costs are $1500 per injection, and at this point repeated injections are required for treatment. If Novartis were to team up with pSivida on combining Tethadur with Lucentis, this is where costs could really be lowered as potentially only one injection would be required. Any expensive drug that requires repeat injections could end up being significantly cheaper when administered by a sustained release pSivida insert.

The question is, with Tethadur only in preclinical development, isn't it a long way until approval, if and when it comes? Yes, but here we come to the other aspect of pSivida's cost cutting benefits. Once clinical trials are conducted with one insert, pSivida can proceed straight to Phase III for the next drug application with that insert. Such it is doing with the insert used for Iluvien, proceeding directly into two Phase III trials (page 7) for a next-generation posterior uveitis treatment. This should be a comparative shoe-in (if any drug approval can be considered such) for pSivida as it already has an approved insert for that indication. That, and it is developing it independently, as Alimera was not given the licensing rights for treatment of uveitis. No more subsisting on royalties, at least in this case if and when it is approved.

The implications are that if and when Tethadur is approved for a single indication, the clinical pathway will be shortened by years for any indication that follows. This is where serious cost cutting happens - by drastically shortening the clinical pathway not only responsible for direct costs incurred by companies, but for the massive indirect costs embedded in the sheer amount of time it takes to get a drug to market. If costs for biotech companies go down, the costs of the drugs can go down without affecting profitability.

Back to the supply side

What's in it for Big Pharma? Why partner with pSivida? One partnership of pSivida's that isn't obscured in vague language about "leading global pharmaceutical companies" is its partnership with Pfizer (PFE). Pfizer is working with pSivida on what it calls the "latanoprost product" without saying much else. What we do know is that the "latanoprost product" is a pSivida insert designed for Xalatan. Xalatan is Pfizer's former blockbuster glaucoma drug. The patent expired in 2011, and sales last quarter were only $147M (page 65), Pfizer's third biggest sales decline for a single drug last quarter at 30%. The market is shifting to generic latanoprost.

If Pfizer successfully combines Xalatan with a pSivida's insert, the patent is renewed. That's what's in it for Big Pharma. And yes, restrictive patents will restrict supply and bring price back up, but not nearly as much as a shortened clinical pipeline will bring price down.

Conclusion

The entire insurance-based pharmaceuticals market structure needs to be scrapped and totally redone from scratch. With its given structure of parabolic price increases that do not abate, it simply cannot stand. At some point the money is going to run out and the price structure is going to reset itself with pharmaceutical capital and companies changing hands in restructuring as well. The companies that prepare for this by lowering costs now will weather the storm the best. pSivida as a company may or may not be the key to this specific goal, but its business model of partnering with Big Pharma with potential cost cutting hardware is one way this can, and ultimately will be accomplished. pSivida has already shown it can cut the clinical pathway in half with its approach by skipping Phase I and II with its next generation uveitis insert. That along with Tethadur, which can potentially be applied to a myriad of drugs that require sustained release but are prohibitively expensive, are significant steps in lowering costs in the face of massive government-inflated demand. By catching more Big Pharma flies with the honey of renewed patents, pSivida has a pathway of accomplishing this.

As for the near term movements of PSDV, the FDA's answer to Iluvien in the U.S. on October 17 should determine if PSDV halves or doubles.

Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it. I have no business relationship with any company whose stock is mentioned in this article. (More...)


View the original article here

Monday, 2 September 2013

The Fundamental Danger To Biotech And How pSivida's Model Can Help Address It

The biotech industry is fundamentally different from nearly every other industry in the economy. The way biotech is structured affects the way we write about it, analyze it, and invest in it. Those who make it their business to know more than just the basics of what's going on should ask themselves these questions: For any given new drug in the pipeline, how important is price versus safety and efficacy? Is a low price for a new drug even a good thing, or would investors, paradoxically, prefer to see a more expensive drug hit the market?

In almost every other industry, companies compete with one another to produce the best products at the lowest possible price. This is what free market capitalism is all about. Companies competing with one another to satisfy consumers' desires in the cheapest way possible is the very thing that raises our standard of living. It's why the average lower middle class working stiff leads a much more physically comfortable life than any medieval nobleman.

Generally, when two competing companies come out with similar products, investors ask themselves who will undercut whom, how much will the new product cost? Who will offer the cheaper product of a given quality, and may the best entrepreneur win.

This isn't really the case with biotech. While it certainly does not apply in every case and there are of course price limits, there is a clear tendency in biotech to applaud high price tags. To cheer for example when a new cancer drug comes out that will cost patients $10,000 a treatment (as the much hyped and famed Kyprolis costs), not to worry too much about competitors that may come in and undercut that price. That is a concern, but only secondarily, and usually only if a new drug is wildly expensive even for insurance companies. The primary concerns are always FDA approval followed by getting the medical community acquainted with the new treatment so doctors can start billing insurance companies. Price doesn't seem to factor all that much into the equation. We assume that the price will by definition be paid by the consumers regardless and then we start calculating in our heads how many prescriptions it will take for revenues to reach the $1B mark, which is why people are happier if the drug costs $10,000 instead of, say, $8,000. How and why is this the case with biotech?

Mandatory Insurance Warps Demand, Market Exclusivity Warps Supply

The problem with biotech, as it always is with prices, is supply and demand. Both are heavily warped by forces exterior to the market, and this creates a systemic danger to the entire biotech industry, a danger which I will explain shortly.

On the Demand Side

It is natural for the price of life-saving drugs to be much higher than other goods because, all other things being equal, the demand for life is much higher than the demand for any other good. But the amount of GDP being spent on healthcare is rising every year, and that cannot be explained by a snapshot demand curve in time.

According to Aetna, healthcare spending was $2.6T in 2010. That is 17.4% of total nominal 2010 GDP. In 1970, it was $75B, 7% of the total that year. That's 2.5x more health care spending per capita in 40 years. Either Americans are using 2.5x more healthcare services per capita than they were 40 years ago, or health care is 2.5x more expensive. The ugly truth is both. And the even uglier truth is that these two factors feed off each other in a positive feedback loop of higher usage/higher cost.

What are the extra market forces causing this money vacuum feedback loop? On the demand side is mandatory health insurance. The "employer mandate" is not something new to the scene since Obamacare. It has in fact been around since 1951 when the IRS declared employer-based health insurance a tax deductible business expense. The minute you have government taxing one thing for employers but not taxing another thing, demand for the thing not taxed grows beyond what it would have been naturally had employers not been taxed at all. With the added benefit of health insurance expenses becoming a tax shelter, money started crowding into it beyond the necessities of the services the insurance actually provided, and more for the benefit of it being tax deductible. More health insurance please. Additionally, the very fact that the employer is the broker between the insurance company and the healthcare consumer (patient) pushes up demand even further because the consumer does not directly pay for the service, so he cares less about what it costs, as does the employer, because again, every dollar spent is tax deductible for the employer anyway.

After 1951 came Medicare. When Medicare was introduced in the 1960's, demand was even further stimulated. If the government is paying for it, the consumer may as well splurge. It got even more extreme with Bush's Medicare Part D which targeted prescription drug demand specifically. All of this artificial demand has led us to the point where we are today: Only 9.8% of the massive amount of people with health insurance coverage have purchased it directly. The rest have either employer-based or government-sponsored insurance policies. The Obamacare employer mandate will only push demand to even more grotesque heights, as most employers will be actively forced to provide insurance instead of just being passively lured by a tax credit.

To complete the demand side of the picture, the current situation puts the insurance companies in almost complete control. This is not to fault them, because in order to support such a massive clientele liable to overuse the service as they are not directly paying for it, insurance companies need to be able to dictate what prices doctors can charge for just about everything or else lose control of their balance sheets and go under.

In a business where there are so many external non-market forces pushing demand wildly up, it is no wonder that investors cheer higher prices to support that demand. High demand requires higher prices. That's just economic law. And we assume almost any price will be paid by the end consumer. After all, he's covered by insurance he's not even directly paying for, be it government or employer. Bring on the ultra-expensive drugs.

What happens if all insurance is simply rejected? One Dr. Michael Ciampi in Maine decided to do just that in his local practice. As you can see in his price list, prices plummet. Unfortunately, insurance can only be rejected in the case of decentralized doctor services. It cannot be rejected for centralized pharmaceutical goods put out by the biotech industry.

On the Supply Side

When demand goes up, all other things being equal, price goes up. When supply goes down, all other things being equal, price goes even higher. And what is constricting the supply of new drugs? Market exclusivity grants based on patents. I'm not trying to make the case that there should be no patent protection or time-limited exclusivity rights on new drugs. Obviously there should be. I'm just stating what the facts are and the economic consequences of them.

A new molecule drug is patent-protected for 20 years from the moment the patent is issued. Since companies apply for patents during clinical trials and sometimes even before, the number of years the patent lasts on the market varies. Nevertheless, a patent-protected drug has automatically limited supply, being that one company simply decides what that supply will be with competition outlawed. Immediately when a drug goes generic, supply rockets and price drops drastically.

While the main problem is artificially stimulated demand via bloated insurance laws and tax regulations, constricted supply exacerbates the problem. Patent-constricted supply plus heavily stimulated demand equals extremely high prices.

The danger of skyrocketing prices to the biotech industry

Depressions come about when the supply of money in an economy drops suddenly after a protracted expansion. When the supply of money goes up, producers use the money to produce more goods and services. If suddenly the money supply goes down because more people for whatever reason take cash out of the fractional reserve banking system (in our current 10% fractional reserve system the money supply contracts by $10 for every $1 taken out in cash), consumers do not have the amount of money necessary to buy those goods and services at prices that would be profitable for the producers when they were produced at the higher money supply levels. This leads to one of two possibilities:

The producing firm sells their stock of goods and services at drastically lower prices for a loss and the consumers benefit, while the economy readjusts to the new, lower price level with bankruptcies and capital changing handsThe central bank prints more money to reflate the original price level, and everyone shares the pain of inflation and the boom/bust business cycle begins anew

This is what happens every time the money supply expands and then contracts, epicentered in whatever sector the money was mainly going into during the monetary expansion. Last time it was housing. But the artificially stimulated demand for housing is not like that of biotech. There is no insurance company buying houses for people. People buy houses with their own money, or money they borrow from other entities. Either way it's a direct transaction with the end consumer ultimately responsible for the money he used to buy the house. If he doesn't have it, the house goes up for sale cheap and prices start to plummet. The price of prescription drugs, however, can keep going higher even when money supply declines because insurance companies, latched on to the entire economy with an entry point at nearly every employer, can and will keep sucking up all the money needed to support the current pharmaceutical price structure. Again, I am not assigning blame here. Insurance companies need to stay in business, too. This is just what happens when demand and supply are completely out of whack.

But this can only go on for so long. The amount of GDP spent on health care can only go so high before the money simply is simply no longer there to support it, regardless of how many economic entry points insurance companies have to suck it out. No one knows what that point will be, but it's coming. When it does happen, many biotech companies will lose their shirts because the Fed will not be able to reflate again without destroying the currency.

In order to survive, Big Pharma, Specialty Pharma, and Little Pharma will all have to figure out how to lower their costs before they are all forced to do so by the market. A new business model needs to take hold, one that can lower prices even in the face of outrageously distended demand and constricted supply. I believe one company in particular, pSivida, (PSDV) can provide the biotech industry with a good model for how to proceed in lowering costs. What follows is less of a bullish case for the stock per se and more of an analysis of how pSivida's business model works to lower costs while maintaining profits and can and should be adopted by other biotech companies.

How pSivida lowers costs

pSivida's business model is basically to introduce nano-sized machines into the area of ophthalmic drug delivery, increasing effectiveness and, eventually, lowering costs. pSivida develops nano-sized ocular implants that are designed for sustained release of a given drug. It generally partners with other companies by providing the hardware while the partnering company provides the drugs that go into it. pSivida's first ocular drug implants have not been blockbusters, but with every advancement the company addresses a bigger market and could potentially increase the savings from these implants.

Its first product Vitrasert® was approved in 1996 for an obscure eye disease called CMV retinitis, which only occurs in late stage AIDS patients. It is licensed to Bausch and Lomb but royalties to pSivida officially stopped as of March 31. Royalties from Vitrasert have been immaterial for years anyway, as HIV treatments have improved significantly since 1996.

Its next FDA approved product Retisert® was approved in 2005 and licensed also to Bausch and Lomb for the treatment of posterior uveitis, a sight-threatening inflammation of the eye affecting 200,000 people in the US. Retisert is a tiny insert the size of a grain of rice that releases corticosteroids into the eye over a period of two and a half years. Retisert royalty to pSivida amounted to $1.4M (page 38) for 2012, substantially all of its royalties for that year. The rest of its revenues came from collaborative agreements with its partners. Total expenses since 2010 excluding impairment charges have been about $14.5M annually, so royalty from Retisert is not enough. Nevertheless, Retisert was a significant advancement for the company and proved the efficacy of its approach, but since posterior uveitis was generally treated with eyedrops beforehand, Retisert did not serve to lower the costs of treatment, only its efficacy.

pSivida's latest advancement brought to market is Iluvien, licensed to Alimera Sciences (ALIM). Iluvien is an ocular implant designed to treat diabetic macular edema, or DME, also by sustained release of corticosteroids for a period of 3 years. Due to serious side effects including increased ocular pressure, it is only approved for chronic DME patients who have not responded to other therapies, and only in Europe. As for the US, the FDA's decision on Iluvien for chronic DME is expected on October 17 (page 7). Despite pSivida's advances with Iluvien, it is still not cost effective at the proposed price in England. Also, two dozen insurance groups in Germany where most of the revenues are coming from have not yet made a decision to cover its costs. Still, pSivida has been improving its implant technologies, and I believe the cost lowering benefits are still to come, and they will come with Tethadur.

Tethadur would be the holy grail of nano ocular implants. It is basically a nano-silicon sponge with adjustable sized holes depending on what drug and how much of it needs to be released over a given period of time. Tethadur is in preclinical trials testing how insulin as well as Lucentis, Novartis' (NVS) wet AMD treatment, are released by Tethadur. To give you an idea of the sales size of these drugs, Lucentis sales topped $2.4B in 2012. Sanofi's (SNY) insulin drug Lantus reached $5B. We can't say if pSivida is pursuing a partnership with either Sanofi or Novartis with regard to these drugs (I would suspect not for Lantus at least, since insulin is injected in doses way too large for a nano-implant), but pSivida has published three press releases since April involving tech evaluation agreements with three "leading" and "global" pharmaceutical companies involving Tethadur.

Regarding Lucentis for wet AMD, current costs are $1500 per injection, and at this point repeated injections are required for treatment. If Novartis were to team up with pSivida on combining Tethadur with Lucentis, this is where costs could really be lowered as potentially only one injection would be required. Any expensive drug that requires repeat injections could end up being significantly cheaper when administered by a sustained release pSivida insert.

The question is, with Tethadur only in preclinical development, isn't it a long way until approval, if and when it comes? Yes, but here we come to the other aspect of pSivida's cost cutting benefits. Once clinical trials are conducted with one insert, pSivida can proceed straight to Phase III for the next drug application with that insert. Such it is doing with the insert used for Iluvien, proceeding directly into two Phase III trials (page 7) for a next-generation posterior uveitis treatment. This should be a comparative shoe-in (if any drug approval can be considered such) for pSivida as it already has an approved insert for that indication. That, and it is developing it independently, as Alimera was not given the licensing rights for treatment of uveitis. No more subsisting on royalties, at least in this case if and when it is approved.

The implications are that if and when Tethadur is approved for a single indication, the clinical pathway will be shortened by years for any indication that follows. This is where serious cost cutting happens - by drastically shortening the clinical pathway not only responsible for direct costs incurred by companies, but for the massive indirect costs embedded in the sheer amount of time it takes to get a drug to market. If costs for biotech companies go down, the costs of the drugs can go down without affecting profitability.

Back to the supply side

What's in it for Big Pharma? Why partner with pSivida? One partnership of pSivida's that isn't obscured in vague language about "leading global pharmaceutical companies" is its partnership with Pfizer (PFE). Pfizer is working with pSivida on what it calls the "latanoprost product" without saying much else. What we do know is that the "latanoprost product" is a pSivida insert designed for Xalatan. Xalatan is Pfizer's former blockbuster glaucoma drug. The patent expired in 2011, and sales last quarter were only $147M (page 65), Pfizer's third biggest sales decline for a single drug last quarter at 30%. The market is shifting to generic latanoprost.

If Pfizer successfully combines Xalatan with a pSivida's insert, the patent is renewed. That's what's in it for Big Pharma. And yes, restrictive patents will restrict supply and bring price back up, but not nearly as much as a shortened clinical pipeline will bring price down.

Conclusion

The entire insurance-based pharmaceuticals market structure needs to be scrapped and totally redone from scratch. With its given structure of parabolic price increases that do not abate, it simply cannot stand. At some point the money is going to run out and the price structure is going to reset itself with pharmaceutical capital and companies changing hands in restructuring as well. The companies that prepare for this by lowering costs now will weather the storm the best. pSivida as a company may or may not be the key to this specific goal, but its business model of partnering with Big Pharma with potential cost cutting hardware is one way this can, and ultimately will be accomplished. pSivida has already shown it can cut the clinical pathway in half with its approach by skipping Phase I and II with its next generation uveitis insert. That along with Tethadur, which can potentially be applied to a myriad of drugs that require sustained release but are prohibitively expensive, are significant steps in lowering costs in the face of massive government-inflated demand. By catching more Big Pharma flies with the honey of renewed patents, pSivida has a pathway of accomplishing this.

As for the near term movements of PSDV, the FDA's answer to Iluvien in the U.S. on October 17 should determine if PSDV halves or doubles.

Disclosure: I have no positions in any stocks mentioned, and no plans to initiate any positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I am not receiving compensation for it. I have no business relationship with any company whose stock is mentioned in this article. (More...)


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Tuesday, 20 August 2013

Cancer-fighting immune activity boosted by dialing back Treg cell function in animal model

Main Category: Cancer / Oncology
Also Included In: Immune System / Vaccines
Article Date: 20 Aug 2013 - 0:00 PDT Current ratings for:
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By carefully adjusting the function of crucial immune cells, scientists may have developed a completely new type of cancer immunotherapy - harnessing the body's immune system to attack tumors. To accomplish this, they had to thread a needle in immune function, shrinking tumors without triggering unwanted autoimmune responses.

The new research, performed in animals, is not ready for clinical use in humans. However, the approach, making use of a key protein to control immune function, lends itself to further study using candidate drugs that employ the same mechanisms.

"This preclinical study demonstrates proof of principle that using a drug to regulate the function of a special, immunosuppressive subset of so-called T-regulatory (Treg) cells safely controls tumor growth," said study leader Wayne W. Hancock, M.D., Ph.D., of the Division of Transplant Immunology at The Children's Hospital of Philadelphia (CHOP). "It really moves the field along towards a potentially major, new cancer immunotherapy."

Hancock and colleagues published the study in Nature Medicine.

"There's a basic paradox in immunology: why doesn't the immune system prevent cancer in the first place?" said Hancock. The answer is complicated, he adds, but much of it involves a delicate balancing act among elements of the immune system: while immunity protects us against disease, an overly aggressive immune response may trigger dangerous, even life-threatening, autoimmune reactions in which the body attacks itself.

In the current study, Hancock focused on a subtype of immune cells called Foxp3+ Tregs, for short. Tregs were already known to limit autoimmunity, but often at the cost of curtailing immune responses against tumors. "We needed to find a way to reduce Treg function in a way that permits antitumor activity without allowing autoimmune reactions," he said.

Hancock's group showed that inhibiting the enzyme p300 can affect the functions of another protein, Foxp3, which plays a key role in controlling the biology of Tregs. By deleting the gene that expresses p300, the researchers safely reduced Treg function and limited tumor growth in mice. Notably, they also achieved the same effects on p300 and Tregs in mice by using a drug that inhibits p300 in normal mice.

Hancock will pursue further investigations into targeting p300 in immunotherapy. The preclinical findings offer encouraging potential for being translated into the clinic, said Hancock, who added that pharmaceutical companies have expressed interest in researching this approach as a possible cancer therapy.

The antitumor study, down-regulating Treg function, is the flip side of another part of Hancock's Treg research. In a 2007 animal study, also in Nature Medicine, he increased Treg function with the goal of suppressing the immune response to allow the body to better tolerate organ transplants. In the current study, decreasing Treg activity permitted the immune system to attack an unwelcome visitor - a tumor. In both cases, he relied on epigenetic processes - using groups of chemicals called acetyl groups to modify key proteins - but in opposite directions. "This is the yin and yang of immune function," he added.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our cancer / oncology section for the latest news on this subject.

The National Institutes of Health (grants AI073489, AI095353, and CA158941, all to Hancock) supported this research. In addition to his CHOP position, Hancock is on the faculty of the Perelman School of Medicine at the University of Pennsylvania.

Yujie Liu et al., "Inhibition of p300 impairs Foxp3+ T regulatory cell function and promotes antitumor immunity," Nature Medicine, published online Aug. 18, 2013. doi:10.1038/nm.3286

Children's Hospital of Philadelphia

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Anglia Ruskin experts want introduction of new treatment model for ductal carcinoma in situ (DCIS) patients

Main Category: Breast Cancer
Article Date: 20 Aug 2013 - 1:00 PDT Current ratings for:
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Breast cancer specialists at Anglia Ruskin University are proposing the introduction of a new model to provide safer treatment for patients with ductal carcinoma in situ (DCIS), the most common form of non-invasive breast cancer.

Writing in the latest edition of The Lancet Oncology journal, Professor John Benson and Professor Gordon Wishart state that therapies such as radiotherapy and tamoxifen, which can impair quality of life and increase health-care costs, are not necessary for all patients.

DCIS is an early form of breast cancer which is commonly detected by screening programmes and is not life-threatening. The surgeons believe that recent research into molecular markers can be used to develop a model to identify the low risk cases that may avoid harmful treatment and high risk cases where therapy can be maximised.

Over the past 30 years, clinicians have benefited from the use of predictive models to treat early invasive breast cancer, which incorporate not only tumour size, grade, and lymph node status, but also variables such as age and molecular markers such as the oestrogen and HER2 receptor. Professor Benson and Professor Wishart say that a similar approach would help with decision-making for DCIS patients after initial breast-conserving surgery (lumpectomy).

The most contentious issue surrounds radiotherapy and whether all patients undergoing breast-conserving surgery should receive it. The authors believe that if toxic effects of radiotherapy exceed any oncological gains amongst DCIS patients, it is likely to lead to a higher all-cause mortality rate.

Gordon Wishart, Professor of Cancer Surgery at Anglia Ruskin, said: "A recent review of the NHS Breast Cancer Screening Programme raised awareness of the detection of low risk cancers that may never reduce a patient's life expectancy.

"A proportion of cases detected with routine screening would not have progressed to a life-threatening form of breast cancer during the patient's lifetime, and overdiagnosis of breast cancer is a cause for concern. In fact, within older age groups life expectancy is likely to be determined not by a diagnosis of DCIS, but by competing causes of death.

"Some of the key molecular events that characterise progression of DCIS to invasive cancer have been identified, and the next logical step is to develop and validate predictive models. These models should allow individualisation of treatments, meaning withholding not only radiotherapy and hormonal therapies, but even surgery for certain patients.

"A comprehensive management strategy should integrate clinicopathological features and molecular profiling, and take into account patient-related factors such as age, other illnesses, breast size and personal preference.

"Present treatment options for DCIS are acknowledged as being excessive for many patients, and the aim of molecular profiling is to ensure that additional treatments such as radiotherapy are restricted to patients at highest risk of invasive recurrence."

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our breast cancer section for the latest news on this subject.

Predictors of recurrence for ductal carcinoma in situ after breast-conserving surgery

The Lancet Oncology, Volume 14, Issue 9, Pages e348 - e357, August 2013 doi:10.1016/S1470-2045(13)70135-9

Prof John R Benson DM, Prof Gordon C Wishart MD

Anglia Ruskin University

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Monday, 19 August 2013

Mathematical model makes defensible estimates of how scenarios might play out if anthrax were released in a terrorist attack

Main Category: Bio-terrorism / Terrorism
Also Included In: Public Health
Article Date: 19 Aug 2013 - 1:00 PDT Current ratings for:
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If terrorists targeted the United States with an anthrax attack, health care providers and policy makers would need key information - such as knowing the likelihood of an individual becoming infected, how many cases to expect and in what pattern, and how long to give antibiotics - to protect people from the deadly bacteria.

Those questions gained urgency when anthrax-laced letters killed five people and infected 17 others in the wake of the terror attacks of September 2001. Now, using information from prior animal studies and data from a deadly anthrax exposure accident in Russia in the late 1970s, University of Utah and George E. Wahlen Department of Veterans Affairs Medical Center researchers have developed a mathematical model to help answer critical questions and guide the response to a large-scale anthrax exposure.

In a study in PLOS Pathogens online, the researchers use their model to estimate that for an individual to have a 50 percent chance of becoming infected with anthrax (known as ID50), he or she would have to inhale 11,000 spores of the bacteria. A 10 percent chance of being infected would require inhaling 1,700 spores and a 1 percent chance of infection would occur by inhaling 160 spores. The researchers also found that at ID50, the median time for anthrax symptoms to appear is 9.9 days and that the optimal time to take antibiotics is 60 days.

"Anthrax is a well-studied disease and experimental animal data exist, but there is no real good information on dose response for the disease in humans," says Adi V. Gundlapalli, M.D., Ph.D., an infectious diseases specialist and epidemiologist, associate professor of internal medicine at the U of U School of Medicine and staff physician at the Salt Lake City George E. Wahlen Department of Veterans Affairs Medical Center. "We don't want to be overly fearful, but we need to be prepared in the event of a bioterrorism attack with anthrax."

Although studies with animals at other institutions have looked at anthrax, the data are limited and usually involved vaccine testing and not exposure amounts for infection. Gleaning information from accidental exposures in isolated cases is difficult and not often helpful. So, Toth and Gundlapalli gathered what useful information from animal studies reported in the medical literature and then combined it with data from an accidental exposure at a Soviet Union bioterrorism plant that occurred in the city of Sverdlovsk, Russia, in 1979.

Gundlapalli, who as a postdoctoral fellow at the U of U helped build a bioterrorism surveillance system for the 2002 Winter Olympics in Salt Lake City, and Damon J.A. Toth, Ph.D., a mathematician and assistant professor of internal medicine at the U of U, are co-first authors on the study.

Anthrax is found on the skin of dead animals and its spores can live thousands of years. People can become infected when they are in close proximity to anthrax, such as a farmworker who might be exposed to a dead animal and inhales spores of the bacteria. But it also can be manufactured in laboratories and spread in other ways, such as when people opened letters containing anthrax or when the spores are put into an aerosol and dispersed over large areas by wind currents.

Previous studies at other institutions had provided widely varying estimates of the chance of becoming infected with anthrax with low dose exposure. For example, one model based on animal data estimated a 1 percent chance of becoming infected from inhaling one spore, while another study estimated that healthy humans would have virtually no chance of becoming infected after inhaling up to 600 spores. But analyzing the results from a better documented, non-human primate study at another institution, in combination with a carefully constructed mathematical model appropriate for humans, Toth estimated that the number of spores required for a 1 percent chance of infection is 160. These estimates were derived by developing and refining a competing-risks model in which the inhaled bacteria is trying to set up an infection in the lungs and the human body is trying to expel or control the bacteria. Toth then used available experimental animal data to optimize the working of the model to produce results that matched the timing of cases at Sverdlovsk.

"Our study, for the first time, takes all the best data and modeling techniques available on dose response and evaluates them critically," Toth says. "No one study satisfied all our criteria to be the best model, so we refined the available information to develop our model."

"When the Institute of Medicine was asked to look at the effectiveness and costs of different strategies to respond to an anthrax in 2012, the Committee identified a critical need for accurate information on the time from exposure until people became ill and how this would change depending on the dose," said Andrew Pavia, M.D., professor and chief of pediatric infectious diseases at the University of Utah and a member of the IOM committee that wrote the report, "Prepositioning antibiotics for Anthrax," and a consultant to CDC on anthrax. "The time between exposure and when symptoms develop is the most effective time to administer antibiotics to prevent illness. This study adds a thoughtful approach to using all of the available data to improve these estimates, but considerable uncertainty will remain." Pavia was not involved in the study

Along with existing animal studies, data gathered from the accident at Sverdlovsk proved invaluable. Up to 100 people died when a filter was accidently left off a piece of equipment at a plant that was developing anthrax as a bioterrorism weapon. Spores of the bacteria were released into the air near the town of Sverdlovsk. The Soviets eventually let outside experts in to study the accident. From publicly available accounts, despite limited records and a substantial delay before the investigation, it would appear that scientists were able to estimate when the release happened, plot where people were in the surrounding area when it occurred and then look at weather records to identify wind currents. With that information, they plotted how the spores were scattered in relation to people who became infected.

The timing and geographic pattern of the best documented cases from Sverdlovsk were consistent with both the shape of the dose-response curve and the distribution of incubation periods produced by the new model. The model also sheds light on how long antibiotics should be given after an exposure to decrease the chances of infection. The model's predictions match so well with publicly available Sverdlovsk data that Gundlapalli and Toth believe they can use the model to reasonably estimate how exposures to anthrax would unfold, especially at low doses of the bacteria.

"By combining the data from Sverdlovsk and prior studies, we can make defensible estimates on how scenarios might play out if anthrax were released in a terrorist attack," Gundlapalli says. "How many cases could we expect? When would be expect to see the cases? How long should we treat those exposed with preventive antibiotics? Our model provides real answers to help policy makers when they need that information."

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our bio-terrorism / terrorism section for the latest news on this subject.

Toth DJA, Gundlapalli AV, Schell WA, Bulmahn K, Walton TE, et al. (2013) Quantitative Models of the Dose-Response and Time Course of Inhalational Anthrax in Humans. PLoS Pathog 9(8): e1003555. doi:10.1371/journal.ppat.1003555

University of Utah Health Sciences

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Saturday, 17 August 2013

Prevention strategies the focus of first animal model for sexual transmission of HIV

Main Category: HIV / AIDS
Also Included In: Sexual Health / STDs
Article Date: 17 Aug 2013 - 0:00 PDT Current ratings for:
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Infection by human immunodeficiency virus (HIV) causes acquired immunodeficiency syndrome (AIDS), a debilitating disorder in which progressive weakening of the immune system makes affected individuals more susceptible to potentially life-threatening infections and chronic diseases. Despite advances in the treatment and management of AIDS, there is no cure, and HIV infection remains a major global health problem. According to the WHO, there were an estimated 34 million infected individuals in 2011. Over the last three decades, a number of animal models have been developed to study aspects of HIV infection, pathogenesis and control. However, the currently available models do not recapitulate the physiological environment of the most common route of HIV transmission worldwide, vaginal intercourse. Now, Mary Jane Potash and colleagues from St. Luke's-Roosevelt Hospital Center and Columbia University Medical Center in New York, NY, have developed an approach for modelling heterosexual transmission of HIV in vivo. Their work was published recently in Disease Models & Mechanisms.

The work stems from an earlier collaboration between Potash and David J. Volsky (also from Columbia University); they established a chimeric HIV clone with a genetic modification that allows the virus to propagate in rodents instead of humans. Infection of mice with these viruses has been successfully applied to study aspects of HIV neuropathogenesis and to evaluate antiretroviral drugs and potential HIV vaccines. In their latest study, Potash and colleagues describe the efficient and reproducible transmission of chimeric HIV from infected male mice to uninfected females via mating, providing the first report of HIV transmission by coitus in an animal model. Treatment of females with antiretroviral drugs prior to mating prevented transmission of the virus, in line with observations in humans. Intriguingly, the efficiency of viral transmission declined during estrus in mice, providing evidence that the hormonal environment in the female reproductive tract can impact on host susceptibility to HIV infection. This finding has implications for HIV infection in humans, where it has been suggested that vulnerability to viral infection could vary during the menstrual cycle.

The model described here has several advantages compared with previous experimental approaches for investigating sexual transmission of HIV. For example, transmission occurs during mating, in contrast with earlier systems in which viral stocks need to be applied manually to the vaginal surface; thus, the system preserves features of the male and female reproductive tracts. This is important, as previous work has shown that host factors and cells in the seminal fluid activate cells in the female reproductive tract and enhance HIV infection, yet the underlying mechanisms remain poorly understood. Similarly, as indicated in this study, the local environment in the female reproductive tract can influence the rate and efficiency of HIV sexual transmission. By preserving the physiological features of coitus, the approach allows the dynamic aspects of viral sexual transmission to be investigated in vivo. Furthermore, the system can be used to investigate the efficacy of new interventive strategies aimed at preventing the most frequent route of HIV transmission.

"We developed this system to study HIV spread by mating in mice with the hope that it can be applied to promote practical approaches to prevent HIV sexual transmission to people at risk" explained Dr Potash, when asked about the goals of this research.

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Friday, 16 August 2013

Red blood cell flow predicted by computer model

Main Category: Blood / Hematology
Article Date: 15 Aug 2013 - 0:00 PDT Current ratings for:
Red blood cell flow predicted by computer model
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Adjacent to the walls of our arterioles, capillaries, and venules -- the blood vessels that make up our microcirculation -- there exists a peculiar thin layer of clear plasma, devoid of red blood cells. Although it is just a few millionths of a meter thick, that layer is vital. It controls, for example, the speed with which platelets can reach the site of a cut and start the clotting process.

"If you destroy this layer, your bleeding time can go way up, by 60 percent or more, which is a real issue in trauma," said Eric Shaqfeh, the Lester Levi Carter Professor and a professor of chemical engineering and mechanical engineering at Stanford University. Along with his colleagues, Shaqfeh has now created the first simplified computer model of the process that forms that layer -- a model that could help to improve the design of artificial platelets and medical treatments for trauma injuries and for blood disorders such as sickle cell anemia and malaria.

The model is described in a paper appearing in the journal Physics of Fluids.

The thin plasma layer, known as the Fåhræus-Lindqvist layer, is created naturally when blood flows through small vessels. In the microcirculation, the layer forms because red blood cells tend to naturally deform and lift away from the vessel walls. "The reason they don't just continually move away from the wall and go far away is because, as they move away, then also collide with other red blood cells, which force them back," Shaqfeh explained. "So the Fåhræus-Lindqvist layer represents a balance between this lift force and collisional forces that exist in the blood."

Because the deformation of red blood cells is a key factor in the Fåhræus-Lindqvist layer, its properties are altered in diseases, such as sickle cell anemia, that affect the shape and rigidity of those cells. The new model, which is a scaled-down version of an earlier numerical model by Shaqfeh and colleagues that provided the first large-scale, quantitative explanation of the formation of the layer, can predict how blood cells with varying shapes, sizes, and properties -- including the crescent-shaped cells that are the hallmark of sickle cell anemia -- will influence blood flow.

The model can also help predict the outcome of -- and perfect -- treatments for trauma-related injuries. One common thing to do during treatment for trauma injuries is to inject saline, which among other things reduces the hematocrit, the blood fraction of red blood cells. With our model, Shaqfeh said, "we can predict how thick the Fåhræus-Lindqvist layer will be with a given hematocrit, and therefore how close the platelets will be to the periphery of the blood vessels -- and how quickly clotting will occur."

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Monday, 5 August 2013

Stem cell researchers produce new model of leukemia development

Main Category: Lymphoma / Leukemia / Myeloma
Also Included In: Stem Cell Research
Article Date: 02 Aug 2013 - 1:00 PDT Current ratings for:
Stem cell researchers produce new model of leukemia development
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Eight years ago, two former Stanford University postdoctoral fellows, one of them still in California and the other at the Harvard Stem Cell Institute (HSCI) in Cambridge, began exchanging theories about why patients with leukemia stop producing healthy blood cells. What was it, they asked, that caused bone marrow to stop producing normal blood-producing cells?

And after almost a decade of bicoastal collaboration, Emmanuelle Passegué, now a professor in the Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research at the University of California, San Francisco, and Amy Wagers, a professor in Harvard's Department of Stem Cell and Regenerative Biology, have the answer.

They have found that cancer stem cells actively remodel the environment of the bone marrow, where blood cells are formed, so that it is hospitable only to diseased cells. This finding could influence the effectiveness of bone marrow transplants, currently the only cure for late-stage leukemia, but with a 25 percent success rate due to repopulation of residual cancer cells.

Their results, which were recently published online in Cell Stem Cell, show that leukemia cells cannot replicate in the bone marrow niche as well as healthy blood-forming stem cells can, so the cancer cells gain the advantage by triggering bone marrow-maintenance cells to deposit collagen and inflammatory proteins, leading to fibrosis - or scarring - of the bone marrow cavity.

"They remodel the microenvironment so that it is basically callous, kicking the normal stem cells out of the bone marrow and encouraging the production of even more leukemic cells," Passegué said. This model is a shift from the widely held theory that cancer cells simply crowd out the healthy cells.

Passegué and Wagers stayed in touch, despite the distance between their laboratories, via annual, two-day, "off-the-record" symposiums of junior investigators at the Harvard Stem Cell Institute and the California Institute for Regenerative Medicine (CIRM). The meetings, which began in 2005 and have continued, require all registrants to keep presentations no longer than 15 minutes and only to discuss unpublished work. "It's sort of Las Vegas rules," Wagers said.

At the second such meeting, Passegué was intrigued by Wagers' cell isolation-based approach to studying the bone marrow niche, the environment where stem cells are found. In the ensuing years, the two scientists swapped protocols, chemical reagents, mice, and even postdoctoral researchers in the pursuit of discovering what causes healthy blood cell dysfunction in leukemia. "Wagers was really involved as a creative spirit in the development of this story," Passegué said.

The observation that leukemia cells can remodel the bone marrow niche parallels work done by HSCI co-director David Scadden of the Harvard-affiliated Massachusetts General Hospital, who demonstrated that particular genetic modifications of bone-forming cells initiate changes in the marrow cavity that suppress normal blood formation and promote the emergence of leukemic cells. "So there's this bidirectional communication that's self-reinforcing, "Wagers said. "And if there's a communication loop like that, you can think about interrupting in many different ways."

Passegué wants to understand how bone-marrow support cells are manipulated to sustain leukemia cells, instead of normal blood cells, in order to design therapies that block these detrimental changes. In the short term, her work could explain why 75 percent of bone marrow transplants are unsuccessful. "A poor niche is likely a very important contributing factor for failure to engraft," she said. Her lab has shown that fibrotic bone marrow conditions can be reversed in as little as a few months by removing the bad-acting maintenance cells, and she is now investigating how to restore the healthy bone marrow environment in leukemia patients.

Passegué and Wagers believe the success of this research reflects the value of scientific partnerships. "Both HSCI and CIRM understand the importance of fostering the open communication and collaboration that drives innovation in science," Wagers said.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our lymphoma / leukemia / myeloma section for the latest news on this subject.

The 2013 HSCI/California Junior Faculty Symposium will take place Nov. 8 and 9 at the University of California, Los Angeles.

Koen Schepers, now at the University Medical Center Utrecht, was the first author on this study. The work was supported by the National Institutes of Health, CIRM, a NWO Rubicon Fellowship, and a KWF Fellowship.

Harvard University

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Tuesday, 30 July 2013

Innovation in mouse model helps researchers distinguish disease mechanisms and biomarkers

Main Category: Urology / Nephrology
Article Date: 30 Jul 2013 - 2:00 PDT Current ratings for:
Innovation in mouse model helps researchers distinguish disease mechanisms and biomarkers
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A team led by researchers at the National Institutes of Health has overcome a major biological hurdle in an effort to find improved treatments for patients with a rare disease called methylmalonic acidemia (MMA). Using genetically engineered mice created for their studies, the team identified a set of biomarkers of kidney damage - a hallmark of the disorder - and demonstrated that antioxidant therapy protected kidney function in the mice.

Researchers at the National Human Genome Research Institute (NHGRI), part of NIH, validated the same biomarkers in 46 patients with MMA seen at the NIH Clinical Center. The biomarkers offer new tools for monitoring disease progression and the effects of therapies, both of which will be valuable in the researchers' design of clinical trials for this disease.

The discovery, reported in the July 29, 2013, advance online issue of the Proceedings of the National Academy of Sciences, paves the way for use of antioxidant therapy in a clinical trial for patients with MMA. It also illustrates the mechanisms by which dysfunction of mitochondria - the power generators of the cell - affects kidney disease. Mitochondrial dysfunction is a factor not only in rare disorders, such as MMA, but also in a wide variety of common conditions, such as obesity, diabetes and cancer.

MMA affects as many as one in 67,000 children born in the United States. It can have several different causes, all involving loss of function of a metabolic pathway that moderates levels of an organic compound called methylmalonic acid. Affected children are unable to properly metabolize certain amino acids consumed in their diet, which damages a number of organs, most notably the kidneys.

"Metabolic disorders like MMA are extremely difficult to manage because they perturb the delicate balance of chemicals that our bodies need to sustain health," said Daniel Kastner, M.D., Ph.D., NHGRI scientific director. "Given that every newborn in the United States is screened for a number of inherited metabolic disorders, including MMA, there is a critical need for better understanding of the disease mechanisms and therapies to treat them."

MMA is the most common organic acid disorder and invariably impairs kidney function, which can lead to kidney failure. The most common therapy is a restrictive diet, but doctors must resort to dialysis or kidney transplantation when the disease progresses. MMA patients also suffer from severe metabolic instability, failure to thrive, intellectual and physical disabilities, pancreatitis, anemia, seizures, vision loss and strokes.

"There are no definitive treatments for the management of patients with MMA," said Charles Venditti, M.D., Ph.D., senior author and investigator in the Organic Acid Research Section of NHGRI's Genetics and Molecular Biology Branch. "This study is the culmination of collaboration with the patient community. It uses mouse modelling, coupled with innovations in genomics and biochemical analyses, to derive new insights into the causes of renal injury in MMA. Our studies have improved our understanding of the basic biology underlying MMA, created a novel animal model for testing interventions and, now, led us to the promise of a new therapy."

The researchers performed the studies using mice bred to carry gene alterations that disrupt the production of the same mitochondrial enzyme that is defective in patients with MMA. These are called transgenic mice. The enzyme, called methylmalonyl-CoA mutase (MUT), is an important component of the chemical process that metabolizes organic acids, specifically methylmalonic acid.

By measuring gene expression in the transgenic mice using DNA microarrays, researchers discovered 50 biomarkers of gene expression that each indicated declining kidney function. DNA microarrays are silicon chips with many spots to which a given molecule may bind. In this case, the DNA microarrays were used to precisely generate, with the aid of a computer program, a profile of gene expression in a kidney cell.

The researchers chose one of the biomarkers, called lipocalin-2, to test how it correlated with kidney function in 46 MMA patients. Plasma levels of this biomarker rose with kidney deterioration in patients with MMA, and may serve as a valuable indicator of MMA kidney disease progression in the clinic.

"The detection of biomarkers through microarray technology is immensely helpful in pointing to downstream pathways affected by the defective MUT activity," said Irini Manoli, M.D., Ph.D., lead author and a physician scientist and staff clinician in NHGRI's Genetics and Molecular Biology Branch. "The biomarkers provide new plasma or serum tests to follow disease progression in our patients."

Having discovered these important biomarkers of kidney function, the authors turned to kidney physiology experts on their team to explore the structural changes that occur in MMA disease. They analyzed the rate at which the kidneys filter waste from the blood. Co-author and renal physiology expert Jurgen Schnermann, M.D., and members of his laboratory at the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), also part of NIH, demonstrated the early and significant decrease in this rate in MMA mice.

With further studies, the researchers identified increased production of free radicals in tissues from the mice, as well as in the MMA patients. Detection of free radicals indicates chemical instability in cells, which the researchers sought to remedy with antioxidant therapy. After treating the mice with two forms of dietary antioxidants, the researchers observed that the biomarkers of kidney damage diminished and the faltering kidney filtration rate tapered off. The findings demonstrated that readily available antioxidants can significantly affect the rate of decline of kidney function in transgenic mice, which replicate the kidney disease of MMA.

"The next step will be to translate these findings to the clinic," Dr. Venditti said. "With a progressive disorder like MMA, we are hopeful that we have achieved a laboratory success that our patients will benefit from in the near future."

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our urology / nephrology section for the latest news on this subject.

Irini Manoli, Justin R. Sysol, Lingli Li, Pascal Houillier, Caterina Garone, Cindy Wang, Patricia M. Zerfas, Kristina Cusmano-Ozog, Sarah Young, Niraj S. Trivedi, Jun Cheng, Jennifer L. Sloan, Randy J. Chandler, Mones Abu-Asab, Maria Tsokos, Abdel G. Elkahloun, Seymour Rosen, Gregory M. Enns, Gerard T. Berry, Victoria Hoffmann, Salvatore DiMauro, Jurgen Schnermann, and Charles P. Venditti, "Targeting proximal tubule mitochondrial dysfunction attenuates the renal disease of methylmalonic acidemia", Published online before print July 29, 2013, doi: 10.1073/pnas.1302764110

For information about the MMA clinical trial, go to ClinicalTrials.gov and search with NCT00078078.

Learn more about the study

NIH/National Human Genome Research Institute

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