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In a unanimous decision, the United States Supreme Court decided yesterday that pharmaceutical and biotechnology companies may have an obligation to disclose adverse events to investors, even if the data is not statistically significant.

I previously discussed the case of Matrixx Initiatives, Inc. v. Siracusano on this blog and correctly predicted that the Supreme Court would uphold the decision of Court of Appeals for the Ninth Circuit.  The result is a valid securities class action fraud claim that can now go to trial, or more likely, a financial settlement will be worked out.

You can read more on the background to this case in my previous post, but at issue was whether Matrixx Initiatives, Inc. (Matrixx) mislead investors by not disclosing reports that some consumers had lost their sense of smell (anosmia) after using Zicam Cold Remedy.   Despite product liability lawsuits, complaints from consumers and medical scientists drawing the company’s attention to previous studies linking zinc sulfate (contained in the Zicam nasal gel) to loss of smell, Matrixx continued to be optimistic to investors about the company’s performance and prospects.

In the November 2003 Form 10-Q filed with the Securities and Exchange Commission (SEC), the company made no disclosure that two lawsuits had been filed over alleging use of Zicam had caused a loss of smell.

The decision in Matrixx Initiatives, Inc., v. Siracusano case has major implications for investor relations, public relations and corporate communications departments of publicly traded companies within the biopharmaceutical industry.

Under U.S. Securities and Exchange Commission (SEC) Rule 10b-5 companies have an obligation to disclose material facts related to statements that are made that could impact the purchase or sale of stock i.e. you have to provide all the information necessary to avoid a statement being misleading.  This does not mean that companies have to share all material information about their products, they control what they say, but what they say has to contain all the material facts necessary for it to be truthful and accurate.

Say a major pharma company issues positive press releases at a major medical congress announcing great clinical trial results, while at the same time the Data Monitoring Committee (DMC) is meeting to terminate the study because the drug has too many adverse events.  My reading of the Matrixx decision is that the company cannot make the positive statements without including the information about their concerns about adverse events.  In those circumstances they might be better off not making the positive press releases, rather than potential misleading investors into buying stock on the back of this data, when the drug may end up being terminated shortly afterwards.

As Justice Sotomayor states in her opinion, “the materiality of adverse event reports cannot be reduced to a bright-line rule.” Matrixx Initiatives, Inc. v. Siracusano, 563 U.S. ___ (2011) (slip op., at 1-2).

The presence or absence of statistical significance is not the key factor as to whether an adverse event is material or not.

“A lack of statistically significant data does not mean that medical experts have no reliable basis for inferring a causal link between a drug and adverse events.”

(slip op., at 12).   As Justice Kagan noted in her questioning at oral argument and Justice Sotomayor picked up in her opinion, “[t]he FDA similarly does not limit the evidence it considers for purposes of assessing causation and taking regulatory action to statistically significant data.” (slip op at 13).

Justice Sotomayor goes on to conclude that reasonable investors may also base their decision on non-statistically significant data.  The challenge that the industry now faces is determining what information is “material” and needs to be disclosed.  A bright-line rule of statistical significance would have made this easy.

Companies, their investor relations and public relations agencies are now faced with the question of what is “material”, and what is not.  The guidance the court offers is that:

“assessing the materiality of adverse event reports is a “fact-specific” inquiry that requires consideration of the source, content, and context of the reports.”

(slip op., at 15, citations omitted).  The Court notes this does not mean that “pharmaceutical manufacturers must disclose all reports of adverse events” only those for which “a reasonable investor would have viewed the nondisclosed information as having significantly altered the total mix of information made available” (slip op., at 15, citations and quotation marks omitted).

So should all adverse events be reported?  That’s one possible way to avoid deciding what’s material, but Justice Sotomayor, clearly states that this is not the standard to be applied. She states,

“mere existence of reports of adverse events which says nothing in and of itself about whether the drug is causing the events – will not satisfy the standard.”

(slip op., at 16). What is needed is some link between the adverse event and the drug that suggests possible causality, what Justice Sotomayor describes as a “contextual inquiry.”  She goes on to say that it is this contextual inquiry that can come from other sources or reports.  In the Matrixx case this would have come from the filing of lawsuits, the concerns of academics about causal links, consumer complaints, the presentation of a scientific poster etc.

“This contextual inquiry may reveal in some cases that reasonable investors would have viewed reports of adverse events as material even though the reports did not provide statistically significant evidence of a causal link.”

(slip op., at 16).  The conclusion from the Matrixx case is that publicly listed companies should be very careful of the information that they tell the market.  As Justice Sotomayor notes:

“Even with respect to information that a reasonable investor might consider material, companies can control what they have to disclose under these provisions by controlling what they say to the market.”

(slip op., at 16).  Whatever information is given to the market e.g. investor presentations at conferences, press releases, press briefings or SEC reports, the information should not be misleading through the omission of material facts.

What the Matrixx decision does is include adverse events as possible material facts, even those adverse events that have not been proved to be causal, or have reached statistical significance.  The conclusion being that disclosure of adverse event data may need to be included, if the omission of this information could impact the decision making of a reasonable investor.

In practice, clinical departments and medical affairs will need to be more closely involved with investor relations, and judgments will have to be made as to what information is disclosed.  Any time a judgment is required, there are likely to be differences in opinion as to what is “material” or not.  Prudent companies should consider sharing more information rather than less, but how to do this in a way that does not overburden investors will be the challenge.

 

One of the messages that I have taken away from the European Association of Urology meeting in Vienna, is the increasing complexity of treatment options for advanced prostate cancer.  However, I have equally come away with the impression that company sponsored sessions is not the right way to provide continuing medical education (CME), if not done in an independent way.  

There are 28 industry symposia at EAU in Vienna, each sponsored by one company.  That’s a lot! Of the sessions I have been too, all have prominently featured the company logo, name or some form of branding on the invitations, slides and meeting materials.  If you want more information afterwards, the pharma company (not any CME provider), will contact you. 

What’s more the slides presented are all in a similar format no doubt having been prepared by the company’s agency, and the content appears to have been carefully scripted to focus on the company’s product. 

So when sanofi-aventis at their symposia talk about prostate cancer and discuss one patient, it should come as no surprise that the patient ended up on cabazitaxel, and the only clinical trial data presented in any great detail was, you guessed it, for cabazitaxel.  “You can start using it tomorrow in your practice” was the underlying message.

The key opinion leaders (KOLs) at these sponsored meetings focus their messages where they have no doubt been directed. “In my hands cabazitaxel is well tolerated.”   It’s been fun to watch the same KOL turn up at different symposia, and focus his messaging on a different product each time.  A paid advocate for one product does not take his advocacy with him to another company’s symposia!

While I don’t doubt that the information each company presents is technically and factually accurate, it’s clear that the experienced KOLs know not to bite the hand that feeds and play the game. But should doctors have to attend multiple symposia to work out how to put the pieces of the jigsaw together?

The model I have seen at United States medical meetings where a topic is focused on, and sponsoring companies have no role in writing the slides, selecting the KOLs or scripting it, is far superior.  Fair balance and independence for CME activities are what doctors deserve in a promotional world. 

The challenge of quasi-promotional symposia such as the ones I have attended in Vienna, is that doctors can’t rely on the company sponsored session to help them understand how to view competing or different treatment options. As advanced prostate cancer becomes more complex, the need for independent CME becomes increasingly important.  European physicians should insist on nothing less.

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Today at the European Association of Urology (EAU) annual meeting in Vienna, the big news was that 2010 was a “Grand Cru” year for new treatments for advanced prostate cancer.  Not only that, but sanofi-aventis announced that they had received European marketing approval for cabazitaxel (Jevtana®) in metastatic hormone resistance prostate cancer mHRPC.

The fact that there are now several new treatments available (or expected to be available in the not too distant future) is good news for patients and physicians.

What is interesting about prostate cancer is that it in terms of incidence it is comparable to breast cancer, yet seems to end up with far fewer resources and publicity.  Prostate cancer is to men, what breast cancer is to women.

The EAU 2011 Congress website has a variety of podcasts and webcasts of presentations, and I encourage anyone interested in the latest developments to check out the wealth of information they offer.  In particular, the presentation by Professor Johann De Bono from the Royal Marsden in the high risk prostate cancer plenary session today was one of my highlights of the meeting.

The take home message I obtained from EAU in Vienna is the excitement of new treatment options for castration resistant prostate cancer (CRPC) such as cabazitaxel, sipuleucel-T and abiraterone.  The challenge may well be to work out how best to use these new therapies, ie in what sequence and what potential combinations may evolve in the future.

However, as Professor Bertrand Tombal from Louvain in Belgium declared, 2010 was a Grand Cru for new prostate cancer treatments.  That is good news indeed.

 

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Hospital marketing departments love new technology – the latest imaging, diagnostic or surgical equipment offers a point of differentiation from the competition.  This is particularly important in the United States where patients have a choice of hospital and surgeon.   Advertisements highlighting new technology are common, and patients actively seek out the “latest” option.

Today at the European Association of Urology (EAU) annual congress in Vienna, Associate Professsor Axel Merseburger from Hannover in Germany discussed some of the challenges with robotic surgery for prostatectomy or partial nepthrectomy.

  1. Lack of data showing an improved functional outcome compared to single port laparascopy or open surgery.  I was surprised that there are no comparative clinical trials that show robotic surgery to be better/worse than other surgical techniques. Complication rates remain inconclusive and urinary function is comparable. What is more, the panel of leading urologists concluded that high quality clinical trials would be difficult to design and enroll. One challenge in any surgical technique clinical trial is controlling for surgical experience; an important factor in determining outcome.   
  2. The need for licensing of robotic surgeons.  In the same way that airline pilots need to renew their licence every year and show they are competent in the skills required to fly a plane, there seemed to be concensus by the EAU panel that some form of “licensing” for robotic surgery should be required. However, as one member of the panel pointed out, it takes 250 patients to become proficient in new technology, which raises the issue of how that skill is obtained and if you were a patient, would you like to be one of those initial 250?
  3. The cost/benefit trade-off for robotic surgery remains unclear.  Robotic surgery takes longer, but is associated with shorter hospital stays, reduced blood loss and distinct cosmetic benefits. The fact that so much can be done through a small incision through the belly button is quite impressive.    However, the higher cost associated with the robotic procedures in terms of time, equipment and training has to be considered when there is no evidence of better functional outcome.  Do the benefits outweigh the costs?  The answer to that is not yet clear.

The take home that I took from the presentation by Dr Merseburger is that choice of surgeon is the key factor when facing any urology surgical procedure. As Dr Merseburger stated in one of his slides, “The risk of complication is related to the surgeons experience regardless of the surgical approach.” 

Those patients who are interested in robotic surgery should carefully consider the surgeon’s experience, with that particular equipment.  I expect we will see an ongoing debate about how innovations in surgical technology should be evaluated.

Nanotechnology is set to have a major impact on drug development and new products for the diagnosis and treatment of cancer.  Research from UCSF and Northwestern University published earlier this year in “Science Translational Medicine” shows this potential.

Edward Chow and colleagues describe how binding the cancer chemotherapy doxorubicin (DOX) to carbon nanoparticles 2-8nm in diameter in the form of a diamond, “nanodiamond” (ND), improved drug efficacy and overcame drug resistance.  Although this pre-clinical animal research has not yet been confirmed in humans, it raises the possibility of more efficient chemotherapies and the hope of increased survival rates as a result.

The conclusion from this research is that nanodiamonds may be a viable drug delivery platform for small molecules, proteins and nucleic acids. This technology could have an application in wide range of diseases.

Why is nanoparticle-mediated drug delivery more effective? The paper suggests one reason is that the nanodiamond-doxorubicin complex (NDX) allows for a more gradual release of DOX, allowing for increased tumor retention and increased circulation time.

It’s important to note that the NDX complex does not specifically target the drug efflux pumps, such as MDR1 and ABCG2 transporter proteins, responsible for chemoresistance. Instead the NDX complex appears to overcome drug resistance passively by the way DOX is released from the nanodiamond.

This research shows that taking old drugs and combining them with new drug delivery technology may offer therapeutic benefits.  The authors conclude that this research, “serves as a promising foundation for continued NDX development and potential clinical application.”

If successful in humans, it will translate into new product development and market opportunities for emerging biotechnology and biopharmaceutical companies.

 

ResearchBlogging.orgChow, E., Zhang, X., Chen, M., Lam, R., Robinson, E., Huang, H., Schaffer, D., Osawa, E., Goga, A., & Ho, D. (2011). Nanodiamond Therapeutic Delivery Agents Mediate Enhanced Chemoresistant Tumor Treatment Science Translational Medicine, 3 (73), 73-73 DOI: 10.1126/scitranslmed.3001713

Innovation in drug delivery presents opportunities for biotechnology companies, and is an area I expect we will see major leaps forward through nanotechnology.

Nanotechnology is the application of science and engineering to materials that are between 1 and 100 nanometers (nm) in size.  The Environment Protection Agency (EPA) defines nanotechnology as “the creation and use of structures, devices, and systems that have novel properties and functions because of their small size.”

1nm is one-billionth of a meter.  To put this in context, 1nm is one seven-thousandth of the width of a red blood cell or one eighty-thousandth of the width of a human hair. These are unimaginably small materials that are engineered to operate at the molecular and atomic level.

What’s more, there are now more than 1000+ consumer products on the market that utilize nanotechnology from the titanium particles in sunscreens to the silver contained in advanced first aid strips/plasters.  Nanotechnology will impact more than $2.5 trillion of manufactured goods by 2015.

Lux Research predicts that by 2014, 16% of manufactured goods in healthcare and life sciences will include nanomaterials.

To date, the United States leads the way in the fast evolving field of nanotechnology.  Between 2001 and 2010, the U.S. Government invested $12.4 billion in nanoscale science, engineering and technology through the U.S. National Nanotechnology Initiative (NNI).

The National Cancer Institute’s “NCI Alliance for Nanotechnology in Cancer” has an excellent website that outlines the potential impact of nanotechnology.

Some of the promising new cancer diagnostics and therapies based on nanotechnology include:

  • Positron Emission Tomography (PET) imaging agents that can be used to assess the responsiveness of tumors to chemotherapy
  • Chemically engineered adenovirus nanoparticle that stimulates the immune system. This is in phase 1 trials for chronic lymphocytic leukemia (CLL).
  • Cyclodextrin-based nanoparticle that encapsulates a small-interfering RNA (siRNA) agent that shuts down a key enzyme in cancer cells
  • CRLX101, a cyclodextrin-based polymer conjugated to camptothecin is in clinical trials with solid tumor patients
  • A nanoparticle based magnetic resonance imaging (MRI) contrast agent that binds to αvβ3-intregrin, a protein found on newly developed blood vessels associated with tumor development. This is in early clinical trials
  • Technology for the detection of cancer biomarkers such as prostate specific antigen (PSA)
  • Use of carbon nanotubes to improve colorectal cancer imaging.

Emerging companies such as Bind Biosciences are focusing on targeting cancer, inflammatory, cardiovascular diseases and infectious diseases with therapeutic nanoparticles.  Their lead product BIND-014 is currently in phase 1 development.

Innovations in nanotechnology will continue to present new product opportunities for biotechnology, pharmaceutical, medical imaging and diagnostics companies, and should be on everyone’s radar.

 

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Taxanes are a class of drug that are used in breast, lung and ovarian cancer chemotherapy to disrupt the function of microtubules that are essential to cell division. They include paclitaxel (Taxol®) and docetaxel (Taxotere®).

Paclitaxel is also used to prevent the narrowing (restenosis) that occurs with coronary artery stents that are used to open blocked coronary arteries. Drug coated stents (a.k.a. “drug-eluting stents) reduce scar tissue.

Research published in the February 18, 2011 edition of Science, by Farida Hellal and colleagues has now shown that treatment with paclitaxel reduces the scarring associated with spinal cord injury (SCI) and promotes nerve regeneration.

The paper in Science is well worth reading and takes the reader through a logical thought process as the researchers tested their hypothesis that paclitaxel might stabilize microtubules around the site of SCI.

One of the cellular events that occurs after SCI is the activation of transforming growth factor-ß signaling (TGF-ß).

Increased TGF-ß leads to fibrosis or scarring.  TGF-ß acts on Smad2 to bind to microtubules through kinesin-1.  Hellal and colleagues asked if treatment with paclitaxel would impair Smad-dependent TGF-ß signaling? The answer from their elegant series of experiments is that yes it does.

Not only that, but TGF-ß also regulates the axon growth inhibitor, chondroitin sulfate proteoglycans (CSPGs).  The researchers asked whether pacllitaxel decreased CSPGs after SCI?  They found that cultured meningeal cells and astrocytes treated with 10 nM paclitaxel showed a 35% and 32% decrease of glycosaminoglycan (GAG) levels.

The next logical question is whether the reduction of scar formation by paclitaxel results in any benefits for new nerve formation? The regeneration of dorsal root ganglions (DRG) were evaluated.  In what to me was a finding of great significance, the researchers found (references to figures omitted) that:

“Taxol-treated animals had regenerative fibers growing along the edge of the lesion cavity into the injury site and beyond. The longest axons per animal grew 1199 T 250 mm in the Taxol-treated group versus 176 T 225 mm in the vehicle-treated an- imals (n = 13 animals per group; P = 0.002; two- tailed t-test). The Taxol-treated lesion site thus becomes favorable for regeneration of growth-competent axons.”

The final part of this research asked whether treatment with paclitaxel led to any functional improvement after the test animals received a spinal cord injury? They found that those rats that received paclitaxel after injury, had greater improvement in their locomotor function.   The conclusion being that “Taxol-induced functional recovery correlates with its axon growth–inducing effect.”

The results from any animal study must be viewed with caution, since they don’t necessarily translate to humans.  However, this animal research, if supported by data from human clinical trials, suggests that treatment with taxanes may be of benefit to those with spinal cord injuries.

Given the debilitating effect of any spinal cord injury, this is an important finding.

 

ResearchBlogging.orgHellal, F., Hurtado, A., Ruschel, J., Flynn, K., Laskowski, C., Umlauf, M., Kapitein, L., Strikis, D., Lemmon, V., Bixby, J., Hoogenraad, C., & Bradke, F. (2011). Microtubule Stabilization Reduces Scarring and Causes Axon Regeneration After Spinal Cord Injury Science, 331 (6019), 928-931 DOI: 10.1126/science.1201148

I would like to thank Victor Pikov, a neurophysiologist and biomedical engineer at Huntington Medical Research Institutes (HMRI) for drawing my attention to his NeurotechZone Blog that has a really fascinating post on the manufacturing of the next generation of artificial retina, the Argus™ 111, by the Lawrence Livermore National Laboratory (LLNL).

If you have an interest in this area, then Victor is also co-chair of 3rd International Conference on Neuroprosthetic Devices (ICNPD-2011) to be held in Sydney from November 25-26, 2011. Further information can be found on NeuroTechZone.

Second Sight Medical Products recently obtained a CE mark and European Market Approval for the Argus™ II system that incorporates 60 electrodes into the retinal prosthesis.

However the next generation of artificial retina, the Argus™ III is already in development.  It has 200 electrodes – a quantum leap forwards.  It’s hard not believe that an array that is four times as densely packed with sensors, will not provide improved vision.

Second Sight will no doubt be planning clinical trials for Argus™ III and it sounds like it will provide a further leap forward in the technology to restore some sense of vision to patients who have lost their sight through age-related macular degeneration (AMD) or retinitis pigmentosa (RP).

I wrote last week about Second Sight’s European Marketing Approval for the Argus II “artificial retina”.  What this news also stands for is the success of collaboration as a route to innovation.

The Artificial Retina Project (“Restoring Sight through Science”) through which Argus II was developed is a collaborative effort between six United States Department of Energy (DOE) research institutions, 4 universities and private industry.

Each offers unique scientific knowledge and specialist expertise, without which it is unlikely the project (that is continuing with the development of a more advanced Argus III artificial retina) would have been successful.

I’ve listed the collaborators below and as recorded on the DOE website, what they bring to the Artificial Retina Project.

DOE National Labs:

  • Argonne National Laboratory – Performs packaging and hermetic-seal research to protect the prosthetic device from the salty eye environment, using their R&D 100 award-winning ultrananocrystalline diamond technology.
  • Lawrence Livermore National Laboratory (LLNL) – Uses microfabrication technology to develop thin, flexible neural electrode arrays that conform to the retina’s curved shape. LLNL also uses advanced packaging technology and system-level integration to interconnect the electronics package and the thin-film electrode array.
  • Oak Ridge National Laboratory – Measures the effect of increasing the number of electrodes on the quality of the electrical signals used to stimulate the surviving neural cells in the retina.
  • Sandia National Laboratories – Develops microelectromechanical (MEMS) devices and high-voltage subsystems for advanced implant designs. These include microtools, electronics packaging, and application-specific integrated circuits (ASICs) to allow high-density interconnects and electrode arrays.
  • Brookhaven National Laboratory – Performs neuroscience imaging studies of the Model 1 retinal prosthesis.

Universities:

  • Doheny Eye Institute at the University of Southern California – Provides medical direction and performs preclinical and clinical testing of the electrode array implants. Leads the Artificial Retina Project.
  • University of California, Santa Cruz – Performs bidirectional telemetry for wireless communication and chip design for stimulating the electrode array.
  • North Carolina State University – Performs electromagnetic and thermal modeling of the device to help determine how much energy can be used to stimulate the remaining nondiseased cells.
  • California Institute of Technology – Performs real-time image processing of miniature camera output and provides optimization of visual perception.

In October 2004, Second Sight Medical Products and the DOE signed a Co-Operative Research and Development Agreement (CRADA) in which the above institutions agreed to share intellectual property and royalties from their research, with Second Sight chosen to be the commercial partner.  As part of the CRADA, Second Sight obtained a limited, exclusive license to the inventions developed during the DOE Retinal Prosthesis Project.

You can find more information about the history of this fascinating project on the Artificial Retina Project website, that also has links to several patient stories from around the world.

The Artificial Retina Project is a case study on the success of collaboration.  Whether such an ambitious project that was funded by the US Government would ever have taken place in the private sector is the question that comes to my mind?  Would a private company have been able to harness the intellectual power of 10 research institutions in this way?

If not, then do governments have a role to play in biomedical innovation by drawing partners together so that advances in basic research can be applied to new products, whether they be new drugs or novel devices?

And if you agree that governments do have a role to play what should be the extent of government funding?  In the case of artificial retina, the DOE has funded this since 1999, with its contribution rising from $500K to $7M per year. Those numbers may also be direct costs, and not reflect the cost of investments in buildings, research facilities etc.

I’d be interested in any thoughts you would like to share on this.

Continuing my previous post about emerging drugs for osteoporosis, one of the new classes in development are those that target sclerostin.

Sclerostin is a protein produced by osteocytes within bone that inhibits bone formation. It is thought to pass through the surface of bone where it acts on osteoblasts (cells responsible for bone formation).  There it binds to low-density lipoprotein receptors and inhibits the Wnt/beta-catenin signaling involved in bone mass regulation.

There is some uncertainty in the scientific literature as to the precise method by which sclerostin acts on bone. However, the Wnt/beta-catenin osteocytic signaling does play a role in bone homeostasis.

Preclinical animal work using an antibody to sclerostin led to increased bone formation, bone mineral density and bone mineral strength. This supports the concept that inhibition of sclerostin has potential as a treatment for osteoporosis.

Interest in sclerostin has grown enormously, with over 50 abstracts presented on its measurement at the 2010 American Society of Bone and Mineral Research (ASBMR) annual meeting.  Also last year, Biomedica and its distribution partner ALPCO Diagnostics launched the first commercial immunoassay kit for the measurement of circulating sclerostin.

Not surprisingly companies have started to look at sclerostin inhibition as a drug development target.  The leader in the pack is Amgen with AMG 785, a sclerostin monoclonal antibody.

The phase 1 trial results published by Padhi et al in the January issue of the Journal of Bone and Mineral Research (JBMR) show that it was well tolerated in 72 healthy subjects that received AMG 785 or placebo.

AMG 785 is now in phase 2 clinical trials that will look more closely at dosing and efficacy.  A 330 patient study to assess fracture healing is currently recruiting (NCT01081678).  The study will look at three doses of AMG 785 (70mg, 140mg, 210mg ) given by injection subcutaneously (under the skin).

The study hypothesis is that giving AMG 785 to those with a new hip fracture will increase their healing. The functional healing will be measured using the timed-up-and-go (TUG) test i.e. the time to stand up on one’s own, walk three meters, turn around, walk back and sit down.

The estimated primary completion date for this trial is December 2012, so I don’t expect we will see some data till 2013 at the earliest.

Amgen already has a major osteoporosis franchise with denosumab, it’s RANKL inhibitor for postmenopausal women at high risk for fracture. It’s a smart new products strategy to build on this, although its too early to tell whether AMG 785 will make it to market.

One unknown challenge for those targeting sclerostin’s action is whether disruption of Wnt/beta-catenin signaling in bone could lead to the stimulation of cancers elsewhere in the body, since this pathway is also involved in a wide range of cellular signaling in the body, including cancer.

While this may not be a problem in healthy individuals, it could raise the issue of the use of sclerostin inhibitors in those patients with low bone mineral density (BMD) or fractures who are being treated for cancer at the same time. Since skeletal related events (SRE) are seen in many advanced breast and prostate cancer patients, this may be a cause for concern.

Further information on Pharma Strategy Blog where Sally Church has written an excellent post on “Wnt Signaling and Cancer.”

Update Jan 2, 2014 Phase 2 Data for Romosozumab published in NEJM

New Year’s day is not when you might expect the New England Journal of Medicine to publish an online first article. However, that’s what happened yesterday when the phase 2 trial data for romosozumab (AMG 785) in postmenopausal women with osteoporosis was published. The joy of Twitter is that interesting news is rapidly shared:

The trial data published in the NEJM by McClung et al shows that romosozumab, a sclerostin inhibitor being developed by Amgen/UCB Pharma provides increased bone mineral density and bone formation:

“All dose levels of romosozumab were associated with significant increases in bone mineral density at the lumbar spine, including an increase of 11.3% with the 210-mg monthly dose, as compared with a decrease of 0.1% with placebo and increases of 4.1% with alendronate and 7.1% with teriparatide”

In the accompanying NEJM editorial, Carolyn B. Becker MD from Brigham and Women’s Hospital in Boston describes the results as “impressive” and outlines many of the questions that remain unanswered that hopefully the results of the phase 3 trial under way (NCT01631214) will provide.

Whether it is a potential blockbuster as some on Twitter questioned yesterday evening, I think we will have to wait and see what the phase 3 trial data shows in a larger study.

However, based on the phase 2 data published in the NEJM it looks like romosozumab will be a future addition to Amgen’s osteoporosis franchise unless something untoward is seen in the phase 3 trial results.

References

ResearchBlogging.orgPadhi, D., Jang, G., Stouch, B., Fang, L., & Posvar, E. (2011). Single-dose, placebo-controlled, randomized study of AMG 785, a sclerostin monoclonal antibody Journal of Bone and Mineral Research, 26 (1), 19-26 DOI: 10.1002/jbmr.173

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