Showing posts with label novel. Show all posts
Showing posts with label novel. Show all posts

Monday, 9 September 2013

Rexahn Regains Rights To Novel Cancer Drug As Teva Continues Its Pipeline Stumble

(Editors' Note: This article covers a micro-cap stock. Please be aware of the risks associated with these stocks.)

Teva Pharmaceutical Industries (TEVA), the powerful generic giant, has been experiencing trouble with its franchise. Sales are down to $9.8 billion from 10.1 billion in the first six months of 2013. Management has been reshuffled; late last year the CEO was asked to step down and a new man put in charge of generics. Teva's shot at branded pharmaceuticals reached a speed bump in July when a U.S. court invalidated a 2015 patent for big-seller Copaxone, inviting in generics as early as next year. Teva's stock price has not yet recovered. Competitors Mylan, Inc. (MYL) and Momenta Pharmaceuticals (MNTA) are developing similar drugs in a healthcare environment that favors the cheapest compounds that work, causing more pressure.

In the midst of problems, Teva made an unwise decision to relinquish an option to continue with a licensing plan for RX-3117, Rexahn Pharmaceutical's (RNN) unique cancer drug that kills tumor cells. Teva will give back to Rexahn all global rights to make and sell the DNA/RNA inhibitor for treating solid tumors. Teva, however, did fulfill a promise to put RX-3117 under FDA review as a new drug. Rexahn passed the FDA's examination and the drug is on its regulatory path. RX-3117 is a small molecule drug that has shown in studies to enter the bloodstream and cause a therapeutic effect in colon, lung, kidney and pancreas, in addition to overcoming chemotherapy drug resistance.

Teva's public reasoning for ending the work on RX-3117 was stated as a "misalignment" with the company's oncology strategy. Teva wants to focus on hematological cancers like chronic lymphocytic leukemia and non-Hodgkin's lymphoma. If I was a shareholder, I'd be less than happy given Teva's $6.8 billion purchase of Cephalon only two years ago, expressly for the purpose of launching into branded oncology products.

A look at Teva's recent past show fumbling efforts at drugs tried and failed. Last week, the company halted trials of Nuvigil, a me-too treatment for depression and bipolarism, after a Phase III yielded no effects better than placebo. In October 2012, another Phase III was suspended, this time for a generic version of $7 billion blood cancer drug Rituxan, made famous by Roche Holding AG (RHHBY.OB). Another slap in the face for shareholders - developing a biosimilar generic version of Rituxan was the ultimate goal of the joint venture Teva formed with privately-held Lonza four years ago; now competitive positioning will most likely be afforded to generic leader Sandoz.

Teva's bad luck with drug development away from generics came to light in December of last year, when it announced slashing certain oncology and cell therapy programs to the tune of $2 billion. Management themselves admitted acquisitions created a confused pipeline. Studies for lung cancer and a stem cell treatment for peripheral artery disease were cut. Unfortunately, the new focus became, in part, neurology, and we see where that has gotten the company so far. Shareholders are not out of the woods - Teva struck a $376 million deal with Xenon Pharmaceuticals late last year for rights to an ion channel blocker for pain, to bolster its new efforts.

Teva's star as an oncology player has fallen. I believe relinquishing its deal with Rexahn is an example of how it is failing to fill the gap void left by huge generic competition, decreased revenue, no strong branding, and management that looks increasingly incompetent. These problems in a company with a $32 billion market cap should give Teva investors pause and question the logic of terminating a license agreement with Rexahn, especially when it was only in April 2012 that Teva decided to expand its oncology pipeline with a $334 million investment in Mersana Therapeutics. Nine months later, a collaboration with another experimental cancer drug was halted, causing a $109 million write-down. This company appears to be on course to bankrupt its pipeline, lacking the brand differentiation it so desires, and years away from delivering top-line results to replace lost generic revenue.

Big Pharma needs an active pipeline of innovative drugs, not to mention blockbusters, something that has diminished with the mega-mergers of the 1990s. Partnering has long been viewed as key to a successful strategy to stay competitive. History, however, tells a different story filled with pharmaceutical missteps and squandered cash. Just in the last few years, GlaxoSmithKline plc (GSK) mysteriously halted a licensing agreement with Actelion Ltd. (ALIOF.PK) in the midst of Phase III for a new insomnia treatment and was strangely quiet about the reasons. Novartis AG (NVS) wrote off $230 million after shelving plans for what was proclaimed as a major advance in hepatitis C, developed by its then-licensing partner, Human Genome Sciences, after a minor disagreement with the FDA. Most surprising was Sanofi's (SNY) decision to terminate its deal with privately-held Metabolex during Phase II for a diabetes drug expected to be a breakthrough treatment, in spite of favorable data, and without any explanation to shareholders for their action.

With the mistake of returning the RX-3117 license to Rexahn, investors can now add Teva to the list.

I believe that for Rexahn, the return of the license can only be a benefit. Phased trials for RX-3117 will continue with a likely candidate being pancreatic cancer that is hard to treat and attracting the attention of major pharma companies like Merck & Co. (MRK) and Celgene Corp. (CELG). The global pancreatic cancer market is expected to rise to $1.2 billion within two years, and with unsatisfactory treatment options being studied among just a handful of competitors, other, more suitable partners could soon take an active interest in Rexahn and its revolutionary compound.

The foremost risk facing Rexahn is loss of a deep-pocketed partner; however, the company has $15.7 million in cash to bring the company through a number of clinical developments, and a prestigious partner in the University of Maryland for which it is developing RX-21101, a re-engineered form of Taxotere for solid tumors. Other more common risks are enrollment for clinical trials and FDA delays. So far, Rexahn appears to have a favorable, expedited relationship with the FDA as evidenced by its Orphan Drug status for several compound indications,

Rexahn has a platform for over a dozen drugs in targeted tumor therapy, representing billions of potential revenue dollars so that only a small percentage of market share would result in strong licensed sales for the company. Big pharmaceutical firms like Teva are proving that the cancer business is better served by younger, more dynamic companies, and in this light, I believe Rexahn will prevail as a leader in new cancer therapies.

Disclosure: I am long RNN. 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

Novel biomarker could potentially lead to early detection of liver fibrosis

Main Category: Liver Disease / Hepatitis
Article Date: 19 Aug 2013 - 0:00 PDT Current ratings for:
Novel biomarker could potentially lead to early detection of liver fibrosis
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Chronic liver disease is a leading cause of death in the United States, in part because it often causes the formation of harmful scar tissue - a process known as fibrosis. A study published by Cell Press in the journal Immunity reveals the central role the immune molecule interleukin 33 (IL-33) plays in the formation of liver fibrosis. The findings suggest that drugs targeting this molecule could serve as a new treatment strategy to protect against liver fibrosis.

"Currently, the therapeutic options for liver fibrosis are limited and not curative," says senior study author Stefan Wirtz of Friedrich-Alexander University Erlangen-Nuremberg. "We identified novel immunological factors that contribute to the development of liver fibrosis, opening up new avenues for the treatment of this serious condition."

Liver fibrosis refers to the accumulation of harmful deposits of extracellular matrix (ECM) proteins, and it can eventually lead to organ failure. Past studies have suggested that this kind of damage is associated with abnormal immune responses in the liver, but very little was known about the molecules and cells that contribute to fibrosis.

In the new study, Wirtz and his team found that the amount of IL-33 in the blood was higher than normal in patients with liver disease. Following up on this observation, they discovered that injection of IL-33 into mice caused ECM proteins to build up in the liver, whereas mice that were genetically modified to lack IL-33 were largely protected from fibrosis. The researchers went on to identify the immune networks underlying IL-33's harmful effects and discovered that this molecule activates immune cells called type 2 innate lymphoid cells (ILC2), which had never before been linked to liver disease.

"Our findings reveal IL-33 as a novel biomarker that could potentially lead to early detection of fibrosis in patients, which may be extremely valuable for preventing further damage to the liver," Wirtz says. "Moreover, the study shows that drugs targeting IL-33 or ILC2 responses could be a promising strategy to protect against fibrosis and chronic liver disease."

Article adapted by Medical News Today from original press release. Click 'references' tab above for source.
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Thursday, 1 August 2013

"Super Mouse" created in the UK may lead to novel treatment strategies for breast cancer

Main Category: Breast Cancer
Also Included In: Genetics
Article Date: 31 Jul 2013 - 0:00 PDT
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It appears tiny and inconsequential enough, but the "super mouse" - created by researchers at the University of Kentucky Markey Cancer Center some six years ago - has spawned plenty of new research into preventing and/or treating many types of cancer.

Back in 2007, cancer researcher Vivek Rangnekar and his team announced that they discovered a gene - known as Par-4 - that specifically kills cancer cells without killing normal cells. Rangnekar's team used this gene to develop cancer-resistant mice that become known as "super mice" for their ability to stay healthy and tumor-free compared to normal mice.

Since that initial discovery, researchers across the country have built upon Rangnekar's discovery, including a team at the University of Pennsylvania, who recently published findings on how Par-4 downregulation affects breast cancer recurrence.

In a new article for Cancer Cell, UK researchers including Rangnekar as well as Tripti Shrestha-Bhattarai and Nikhil Hebbar discuss a recent study and how its findings may lead to the development of novel treatment strategies for breast cancer.

Breast cancer is the second leading cause of cancer death in women. Even with treatment, one in five patients will relapse from the disease within 10 years, and patients who have triple-negative breast cancer have an especially high risk of both local and distant recurrence. Treatment for these aggressive cancers is difficult because they tend to be resistant to "standard of care" therapies.

The study performed by the UPenn team showed that in women who experienced breast cancer relapse, the Par-4 protein was suppressed. These low levels of Par-4 allowed the cancerous cells to survive and multiply even after a full course of treatment. Conversely, tumor cells that have high levels of Par-4 are eliminated by apoptosis (cell death) following treatment. These new findings may provide insight into deciding which patients are at the highest risk for cancer recurrence.

"What this tells us is that low Par-4 may act as a predictor of breast cancer recurrence," said Rangnekar, associate director for the UK Markey Cancer Center. "This is important, because although this group studied only breast cancer, their observations may be relevant to recurrence in a broad range of cancer types because Par-4 is a general tumor suppressor gene."

Using Par-4 levels as a biomarker prior to treatment - and knowing whether that patient is at an elevated risk of recurrence - would give physicians another tool to use in determining the best course of treatment. Additionally, their findings may provide the basis for the development of novel treatment strategies for breast cancer.

Other 'tumor suppressor' genes exist, says Rangnekar, but what makes Par-4 so special is that it is not mutated as frequently as other known suppressors, and it's "selective" in its actions in that Par-4 will only kill cancer cells and not normal cells. Par-4 can become 'suppressed' or inactivated, leading to tumor re-growth, but Par-4 can be 'activated' again - and one of the next major steps is developing a safe and effective way to activate Par-4 in the cancerous cells.

"If Par-4 is still present in the cells, the strategy should be to try and utilize that Par-4, so as to restore it's apoptotic function and bring about apoptosis of the cancer cells," Rangnekar said.

Researchers are still years away from being ready to test these theories in clinical trials, but Rangnekar says they have already begun looking at agents, both natural and synthetic, that may help restore the expression of Par-4 in human cells, allowing the cancerous cells to become susceptible to treatment. Each new study on Par-4 brings researchers one step closer to developing a powerful method for both treating and preventing many of the deadliest types of cancers.

The findings in the cancer-resistant mouse have stimulated several collaborative projects on Par-4 at UK. Several UK investigators are now examining the role of Par-4 in diverse types of tumors: recently, Rangnekar and UK cancer biologist and immunologist Subbarao Bondada were jointly funded by the National Institutes of Health to study the role of Par-4 in chronic lymphocytic leukemia; UK pathologist Craig Horbinski's group is investigating Par-4 in aggressive brain tumors called glioblastomas; and UK chemist David Watt and cancer biologist Chunming Liu are developing small molecules that can activate Par-4 and kill cancer cells.

"Our multi-disciplinary team, working together, uses a multi-faceted strategy in our research," Rangnekar said. "This allows us to gain a better understanding of the complexities of cancer in order to effectively kill recurrent tumor cells, especially those that have spread from their origin to distant tissue sites."

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.

Par(-4)oxysm in Breast Cancer, Tripti Shrestha-Bhattarai, Nikhil Hebbar, Vivek M. Rangnekar, Cancer Cell, Volume 24, Issue 1, 3-5, 8 July 2013, doi: 10.1016/j.ccr.2013.06.010

University of Kentucky

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Tuesday, 30 July 2013

Novel mechanism identified in host-pathogen gastroenteritis interactions

Main Category: Infectious Diseases / Bacteria / Viruses
Also Included In: GastroIntestinal / Gastroenterology
Article Date: 30 Jul 2013 - 1:00 PDT Current ratings for:
Novel mechanism identified in host-pathogen gastroenteritis interactions
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A seafood contaminant that thrives in brackish water during the summer works like a spy to infiltrate cells and quickly open communication channels to sicken the host, researchers at UT Southwestern Medical Center report.

Vibrio parahaemolyticus bacteria, which cause gastroenteritis, inject proteins called effectors into host cells. One of those effectors, VopQ, almost immediately starts to disrupt the important process of autophagy via a novel channel-forming mechanism, the scientists report in the investigation available online at the Proceedings of the National Academy of Sciences. Autophagy is the cellular housekeeping mechanism used to recycle nutrients in cells as well as to fight off pathogens. The term autophagy comes from the Greek words for self and eating. During the process, nutrients are recycled by the lysosome, an internal organelle, to produce metabolites that can be used by the cell.

"Our study identifies a bacterial effector that creates gated ion channels and reveals a novel mechanism that may regulate autophagy," said Dr. Kim Orth, professor of molecular biology and biochemistry. She is a corresponding author on the published study. The first author is Anju Sreelatha, a graduate student in Dr. Orth's laboratory.

"Disruptions of autophagic pathways are implicated in many human diseases, including neurodegenerative disease, liver disease, some cancers, and cardiomyopathy (heart muscle disease)," Ms. Sreelatha said.

She explained that ion channels are pores in the membranes of cells or of organelles within cells that allow regulated passage of small molecules or ions across membranes. Gated channels have a mechanism that opens and closes them, making these proteins potential targets for drug development.

"The identification of a channel that opens and closes and thereby affects autophagy may give us a handle by which to modulate this important process," she said, adding that the researchers found that VopQ's channel activity turned off autophagy.

"During infection, VopQ is injected into the host cell where the protein binds to a lysosomal membrane protein and forms small pores, all within minutes of infection. The resulting complex of proteins causes ions to leak and the lysosomes to de-acidify. Lacking acidification, lysosomes cannot degrade the unneeded cellular components and autophagy is disrupted," Ms. Sreelatha said.

Dr. Orth said "Bacterial pathogens have evolved a number of ways to target and manipulate host cell signaling; the ability of VopQ to form a gated ion channel and to inhibit autophagy represents a novel mechanism."

Further characterization of the mechanism by which VopQ sabotages cells to disrupt autophagy may lead to a better understanding of host-pathogen interactions as well as advance our understanding of the pathway, eventually leading to new treatments for diseases in which autophagy has gone awry, they noted.

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

Other UT Southwestern scientists involved were Dr. Hui Zheng, a postdoctoral researcher of cell biology, and Dr. Qiu-Xing Jiang, assistant professor of cell biology. Also participating were Terry Bennett and Dr. Vincent Starai of the University of Georgia.

Funding was provided by the National Institute of Allergy and Infectious Diseases; the Burroughs Wellcome Foundation; the Welch Foundation; the National Institute of General Medical Sciences; the Cancer Prevention and Research Institute of Texas; and by University of Georgia Startup Funds.

UT Southwestern Medical Center

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Monday, 29 July 2013

The biological behaviors of neural stem cells regulated by novel nanometer scaffolds

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

Article: " Novel nanometer scaffolds regulate the biological behaviors of neural stem cells," by Jihui Zhou1, Fuge Sui1, Meng Yao2, Yansong Wang2, Yugang Liu2, Feipeng Tian1, Qiang Li1, Xiaofeng He1, Lin Shao1, Zhiqiang Liu1 (1 Longnan Hospital of Daqing, i.e. the Fifth Hospital Affiliated to Qiqihar Medical University, Daqing 163453, Heilongjiang Province, China; 2 Department of Spine Surgery, the Second Hospital Affiliated to Harbin Medical University, Harbin 150086, Heilongjiang Province, China)

Zhou JH, Sui FG, Yao M, Wang YS, Liu YG, Tian FP, Li Q, He XF, Shao L, Liu ZQ. Novel nanometer scaffolds regulate the biological behaviors of neural stem cells. Neural Regen Res. 2013;8(16):1455-1464.

Full text: http://www.sjzsyj.org:8080/Jweb_sjzs/CN/article/downloadArticleFile.do?attachType=PDF&id=614

Neural Regeneration Research

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