Showing posts with label strong. Show all posts
Showing posts with label strong. Show all posts

Saturday, 21 September 2013

Despite The Baby Blues, OvaScience Is A Strong Buy

A single "untitled" letter delivered by the FDA to OvaScience (OVAS) last week requesting more information regarding AUGMENT's (Autologous Germline Mitochondrial Energy Transfer) status as a human cellular and tissue-based product (HCT/P) has sent the company's shares tumbling more than 25% and given investors a case of the baby blues. Although, investors should be thoughtful as to what this new regulatory path, if needed, would mean for the timeline and cost to develop the product I believe the company has a sound strategy to mitigate any effects this delay may cause. The recent pullback in share price provides an excellent entry point for those wanting to invest in a novel scientific product that has the potential to revolutionize the expanding multi-billion dollar in vitro fertilization (IVF) market.

AUGMENT to the Rescue

For a couple struggling with infertility, there are few things in life more powerful than the desire to have children and be parents. As the age at which couples decide to have children continues to increase, it is no surprise that the number of women seeking infertility treatments has skyrocketed. Many women turn to the IVF approach ICSI (intracytoplasmic sperm injection) to increase their chances of conception. However, with a success rate of only 30% it typically takes several cycles for one to become pregnant. With an average cost of $16k per cycle for nondonor (from the mother) and $26k for donor eggs it is easy to understand why this is a billion dollar industry. In addition, current IVF treatments require grueling hormone injections and result in a high incidence of multiple births. OvaScience's AUGMENT is a groundbreaking product being developed to significantly increase a woman's chance of becoming pregnant with IVF and does not require hormonal stimulation or the additional risk of multiple births.

It is scientifically accepted that as a woman ages the quality of her eggs declines due to accumulating genomic mutations in the mitochondria, the eggs primary energy source, resulting in reduced fertility and increased birth defects. Therefore, by age 40 the chance of IVF success is less than 20%. Besides using a young donor egg with functioning mitochondria, there is nothing currently on the market that can increase egg quality and thus fertility. AUGMENT is that product.

There are few products in development that have as high a chance of success as AUGMENT due to the substantial amount of scientific proof of concept data available. Mitochondrial transfer has been shown to substantially increase egg quality and fertility in numerous animal studies and several human trials. In women who had previously failed 2 or more IVF cycles, the pregnancy success rate varied between 25% and 44% with close to 100% of those pregnancies resulting in live births.

Scientifically, it makes sense. Egg quality in older women is poor due to inefficient energy producing mitochondria, so the transfer of fresh mitochondria to the egg replenishes the energy needed to achieve fertilization and early embryo growth. However, since the majority of these studies used donor mitochondria from another individual, the FDA stepped in due to the concerns of mixing mitochondrial DNA from two different individuals.

To avoid this complication, OvaScience uses a unique source of mitochondria isolated from a woman's own germline egg stem cells (EggPC) discovered by their cofounder Dr. Jonathan Tilly while at Harvard Medical School. These mitochondria are then injected back into the woman's own egg along with the male sperm for fertilization. Importantly these EggPCs contain high levels of ATP, energy produced by the mitochondria, making them ideal to replenish the energy levels of the egg. Therefore, there is no reason why IVF success rates would not increase the same if not more than previous mitochondrial transfer studies using this novel technique and cell source.

The Future of AUGMENT

The stock tanked over 25% following OvaScience receiving the "untitled" letter from the FDA questioning the status of AUGMENT as a 361 HCT/P product, which does not require extensive clinical trials or pre-market approval. It must be kept in mind that although OvaScience has been in contact with the FDA regarding their study, apparently the FDA has not been supplied with all the study details. Therefore, the letter from the FDA requesting more information regarding AUGMENT should be seen as just that. OvaScience and all other analysts whose opinions I've read believe AUGMENT qualifies as a 361 HCT/P. After reviewing the requirements I also agree it should fit this status. Importantly, OvaScience's counsel Peter Hutt, who is the former Chief Counsel for the FDA also believes AUGMENT should be regulated under 361 HCT/P and will discuss this with the FDA along with OvaScience senior management. When one looks at the requirements for 361 HCT/P status AUGMENT fits them all.

• Cells or tissue need to have minimal manipulation: AUGMENT techniques do not change the biological characteristics of the mitochondria and no cell culture is required.

• Intended for homologous use: AUGMENT uses a woman's own mitochondria from EggPCs to supplement mitochondria in the woman's egg.

• Its manufacture does not involve combination with another article, except for water, crystalloids, or a sterilizing, preserving, or storage agent (not raising new clinical safety concerns for the HCT/P): AUGMENT mitochondria are isolated and placed in standard buffer for transport.

• It does not have a systemic effect and is not dependent upon the metabolic activity of living cells for its primary function or, if it has such an effect, it is intended for autologous use or allogeneic use in close relatives or for reproductive use: AUGMENT is autologous and is for reproductive use.

Due to AUGMENT meeting all the criteria to be regulated under 361 HCT/P I believe further detailed discussions between OvaScience and the FDA will clarify its regulatory status. If the FDA does not agree and still insists that AUGMENT needs to be regulated as a new investigational drug, then they should redefine the criteria for a HCT/P as AUGMENT clearly meets the current descriptions. Although, these trials would be costly and time consuming to conduct, there is no reason to believe OvaScience would not be successful in demonstrating efficacy and safety. From the recent conference call OvaScience held regarding AUGMENT updates, it was mentioned that some of the data they have already accumulated may be able to be used and other studies that the FDA may require regarding safety were already underway. Due to the stock dropping rapidly following the FDA letter, many law firms are trying to rally class action lawsuits against OvaScience. These are typical lawsuit trolls who are trying to recruit a lead plaintiff and bank some quick money. As most investors know, these lawyers pop up everywhere as soon as a stock's value declines rapidly and very rarely succeed. I think most smart investors in OvaScience realized not meeting HCT/P status was a possibility.

AUGMENT Launch Overseas in 2014

Regardless of the outcome of the US regulatory status of AUGMENT, OvaScience continues to push forward with its plans for 2014 overseas product enrollment and launch. In fact, the majority of global IVF treatment occurs outside the US, mainly in Japan and Europe, which combined, represents more than 4 times the number of IVF cycles in the US. It is important to note, that IVF is typically paid for by people in cash and not normally covered by insurance plans. Therefore, unlike many medical services that must wait 60-180 days for insurance reimbursement, OvaScience would recognize revenue upon completion of service. Moreover, the exorbitant cost of an IVF cycle typically restricts those who use it to the middle, upper class in the US. If AUGMENT can save a couple 1 or 2 cycles of IVF treatment or if standard IVF is simply not working, I would not be surprised to see a high number of couples take the flight overseas to be treated, especially since insurance coverage is not a factor. It is not uncommon to see US couples travel overseas to adopt children, perhaps they would do the same to conceive their own.

OvaTure Overlooked

Although Wall Street is currently focused on AUGMENT, OvaScience's other product in development OvaTure has the potential to change the way IVF is practiced. The OvaTure product takes a woman's own egg stem cells, EggPC, which are free from accumulated genomic mutations and cultures them to create new fresh mature eggs, which can then be fertilized. This product would greatly increase the age at which women could become pregnant. Proof of principle studies have been conducted in mouse models and human EggPCs have been shown to be capable of maturing into eggs. It is likely that the FDA will require regulatory approval for this product as there is cell differentiation and cell culture involved. However, if trials are successful, the product would be groundbreaking.

Potential Risks

As with all small biotech companies there are always risks that need to be taken into account. The main concern of investors has already been factored into the stock and that was the regulatory status of AUGMENT in the US. Although, I believe there is still a good possibility the FDA will agree that the product should be regulated as an HCT/P once provided more details, this is not a guarantee. If time consuming studies are needed to satisfy the FDA then OvaScience may need to raise additional funds. However, revenue from a successful overseas launch could help pay the bills.

Other Important Factors to Consider

In addition to their revolutionary products for the rapidly growing IVF market, there are several other factors that make OvaScience a very attractive investment. There is little to no competition in the space, which will allow OvaScience to capture the majority of the IVF business. Due to the lack of advancements in IVF, OvaScience's AUGMENT product has already gained strong traction in the US with enrollment filled for the AUGMENT study before suspension and numerous advocacy groups lobbying to bring the product to market. Likewise, OvaScience's approaches have been well accepted by the major fertility clinics with a lot of the thought leaders in the field on their Scientific and Product Advisory boards. Importantly, OvaScience also has an executive team, which is second to none. The CEO, Michelle Dipp, M.D., Ph.D has a track record of success, leading the acquisition of her last company Sirtris to GSK for over $700 million and is also the founder of a high profile healthcare investment fund. It is also important to note that many of the senior team members have been actively buying up the stock, including the Dr. Dipp who just entered into a 10b5-1 stock purchase plan.

Conclusion

I believe OvaScience's unique AUGMENT product has a very high chance of success and investors should not be deterred by the FDA asking for more information regarding how the product should be regulated. Worst case scenario, AUGMENT is launched first into the overseas market. This definitely does not warrant the over 30% drop in value the stock has relinquished since last week. OvaScience is a unique play in the rapidly growing IVF market and at these levels is a bargain for investors.

Disclosure: I am long OVAS. 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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Monday, 19 August 2013

Subset of type 1 diabetes patients with strong response to therapy identified

Main Category: Diabetes
Article Date: 19 Aug 2013 - 1:00 PDT Current ratings for:
Subset of type 1 diabetes patients with strong response to therapy identified
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Primary results from a new clinical trial show that patients with type 1 diabetes treated with the monoclonal antibody teplizumab (MacroGenics, Inc.) exhibit greater preservation of C-peptide, a biomarker of islet cell function, compared to controls. Further analyses identified a discrete subset of the treatment group that demonstrated especially robust responses ("responders"), suggesting that these patients could be identified prior to treatment. The trial, entitled "Autoimmunity-Blocking Antibody for Tolerance in Recently Diagnosed Type 1 Diabetes" (AbATE), was conducted by the Immune Tolerance Network (ITN). The results are available online and will be published in the November issue of the journal Diabetes.

The AbATE study, led by Kevan Herold, MD (Yale University), tested teplizumab, which targets the CD3 receptor found on T cells, in patients with new-onset type 1 diabetes. CD3 is required for T-cell activation, which can lead to the destruction of insulin-producing beta cells. A previous ITN study with teplizumab showed that a single course of the drug slowed C-peptide decline in new-onset patients for a year, after which the effects waned. The aim of the AbATE study was to test whether C-peptide preservation could be prolonged by administering two courses of teplizumab, one year apart.

In this open-label, Phase II study, 77 new-onset patients (ages 8 to 30 years old) were randomized to receive either teplizumab or a control. Those in the treatment arm received the scheduled treatment consisting of two 14-day courses of teplizumab, one year apart. Both arms received intensive diabetes care from certified diabetes educators and were followed for two years. The primary endpoint compared C-peptide preservation between the two groups.

After two years, the teplizumab-treated group showed significantly greater preservation of C-peptide (75-percent higher responses compared to the control group).

Further analysis revealed that within the treatment arm two groups of patients could be distinguished based on their C-peptide levels: one group, considered "responders" (22/49), showed very little C-peptide decline over the course of the study (only a 6 percent reduction from baseline), while the "non-responders" (27/49) exhibited a similar rate of C-peptide decline as the control group (less than 40-percent reduction from baseline).

Investigators measured various biomarkers and cell types that might distinguish between these two groups. They found that, at trial entry, "responders" had lower hemoglobin A1c levels (a marker of glucose concentration in the blood) and used less insulin at baseline, compared to "non-responders". Differences in specific T-cell subsets also distinguished between the two groups at baseline, suggesting that immune status might contribute to drug responsiveness. However, further studies will be required to confirm these results.

"This overall approach to identifying characteristics of individuals most likely to respond to therapies shows great promise because the responders in this study experienced a robust and prolonged drug effect," said Dr. Herold. "This type of response has not been seen in other studies of immune therapies."

Type 1 diabetes is a disease marked by immune destruction of insulin-producing beta cells in the pancreas. New-onset patients usually have 20 to 40 percent of their normal beta cell mass remaining, which is still capable of producing insulin. Preserving this remaining mass, even temporarily, could improve long-term clinical outcomes.

Immune modulators, like teplizumab, represent a promising means of inducing tolerance; however, no drug has been shown to prevent or reverse disease, and only a few have temporarily delayed disease progression. The ability to identify a subgroup of patients who may be more responsive to therapy could greatly enhance the clinical use of immune modulators and improve outcomes for those patients. Further analyses with specimens collected from the AbATE study are ongoing to understand the mechanism of response.

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
Visit our diabetes section for the latest news on this subject. Please use one of the following formats to cite this article in your essay, paper or report:

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19 Aug. 2013. APA

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Tuesday, 30 July 2013

MAPS technology may generate vaccines conferring strong immunity at reduced cost and risk

Main Category: Immune System / Vaccines
Article Date: 30 Jul 2013 - 2:00 PDT Current ratings for:
MAPS technology may generate vaccines conferring strong immunity at reduced cost and risk
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A new method of vaccine design, called the Multiple Antigen Presentation System (MAPS), may result in vaccines that bring together the benefits of whole-cell and acellular or defined subunit vaccination. The method, pioneered by researchers at Boston Children's Hospital, permits rapid construction of new vaccines that activate mulitple arms of the immune system simultaneously against one or more pathogens, generating robust immune protection with a lower risk of adverse effects.

As reported by Fan Zhang, PhD, Ying-Jie Lu, PhD, and Richard Malley, MD, from Boston Children's Division of Infectious Disease, in the Proceedings of the National Academy of Sciences on July 29, the method could speed development of new vaccines for a range of globally serious pathogens, or infectious agents.

Broadly speaking, the vaccines available today fall into two categories: whole-cell vaccines, which rely on weakened or killed bacteria or viruses; and acellular or subunit vaccines, which include a limited number of antigens - portions of a pathogen that trigger an immune response. Both approaches have advantages and disadvantages.

"Whole-cell vaccines elicit a broad range of immune responses, often just as an infection would, but can cause side effects and are hard to standardize," said Malley. "Acellular vaccines can provide good early immunity with less risk of side effects, but the immune responses they induce wane with time."

The MAPS method may allow vaccine developers to take a middle ground, where they can link multiple protein and polysaccharide (sugar) antigens from one or more pathogens together in a modular fashion, much as one would connect Lego blocks.

The resulting complex - which resembles a scaffold of polysaccharides studded with proteins - can stimulate both antibody and T-cell responses simultaneously much like whole-cell vaccines, resulting in stronger immunity to the source pathogen(s). However, because the composition of a MAPS vaccine is well defined and based on the use of isolated antigens (as one would find with an acellular vaccine) the risk of side effects should be greatly reduced.

For instance, mice injected with a MAPS vaccine combining proteins from tuberculosis (TB) and polysaccharides from Streptococcus pneumoniae (pneumococcus) mounted vigorous antibody and T-cell responses against TB, whereas those vaccinated with TB protein antigens alone mounted only an antibody response.

Similarly, 90 percent of mice given a MAPS-based vaccine containing multiple pneumococcal polysaccharide and protein antigens were protected from a lethal pneumococcus infection, mounting strong antibody and T-cell responses against the bacteria. By contrast, 30 percent of mice vaccinated with the same antigens in an unbound state survived the same challenge.

"The MAPS technology gives you the advantages of: whole-cell vaccines while being much more deliberate about which antigens you include; doing it in a quantitative and precise way; and including a number of antigens so as to try to replicate the effectiveness of whole-cell vaccination," Malley explained. "The immunogenicity of these constructs is greater than the sum of their parts, somewhat because they are presented to the host as particles."

The system relies on the interactions of two compounds, biotin and rhizavidin, rather than covalent binding as is used in most of the current conjugate vaccines. To build a MAPS vaccine, biotin is bound to the polysaccharide(s) of choice and rhizavidin to the protein(s). The biotin and rhizavidin then bind together through an affinity interaction analogous to Velcro. The construction process is highly efficient, significantly reducing the time and cost of vaccine development and production.

While his team's initial work has focused on bacterial pathogens, Malley believes the technology could impact vaccine development for a broad range of pathogens, in particular those of importance in the developing world. "Technically, one could construct MAPS vaccines for viruses, parasites, even cancer antigens," he said. "And the modularity is such that one could include antigens from multiple pathogens into the same vaccine, allowing the development of combinatorial vaccines much more efficiently."

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

Fan Zhang, Ying-Jie Lu, and Richard Malley "Multiple antigen-presenting system (MAPS) to induce comprehensive B- and T-cell immunity" Published online before print July 29, 2013, doi: 10.1073/pnas.1307228110

The study was supported by the National Institute for Allergy and Infectious Diseases (grant R01AI067737) and the Translational Research Program at Boston Children's Hospital.

Boston Children's Hospital

Please use one of the following formats to cite this article in your essay, paper or report:

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30 Jul. 2013. APA

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