NEWS FEATURE: Networking for new drugs

By Claire Ainsworth

nm1011-1166-I1.jpgAt first sight, it seems like a rather perplexing experiment. In several hospitals across France, some 60 patients are taking part in a clinical trial to test a combination of three drugs. The first striking thing about this trial is that the drugs have already been approved for human use. The second is that each drug is being given at doses between 10 and 100 times weaker than those usually prescribed. Finally, and most surprising of all, none of the patients suffer from the conditions for which these drugs were originally developed. They all have Charcot-Marie-Tooth disease type 1A, a currently incurable neurological condition that causes muscle weakness and loss of touch sensation, and this trial is the result of a radically new approach to understanding and treating disease.

The approach, called network pharmacology, is very different from the current ‘targeted’ method of drug discovery. To design targeted medicines, researchers typically identify a single protein they believe causes the disease and then design a small molecule that binds exclusively to this target. Network pharmacologists take a very different tack. Rather than focusing exclusively on single proteins or individual biochemical pathways, they look at the bigger picture and target the myriad networks of interactions between the molecules in our cells.

“If we want to increase our range of potential drug targets or increase our chances of having a greater clinical effect, then we need to consider multiple modes of perturbation,” says Andrew Hopkins, who researches medicinal informatics at the University of Dundee, UK.

Network pharmacology is only a few years old but has already yielded promising results in preclinical studies, leading to new possibilities for anticancer drugs and antibiotics against multidrug-resistant bacteria. A number of human clinical trials of drugs created using network pharmacology are also underway, such as the Charcot-Marie-Tooth disease trial, which is the brainchild of the biotech company Pharnext, located just outside Paris. The disease affects one in 2,500 people, and current treatment merely manages symptoms with physiotherapy and devices such as leg braces.

Proponents say that drugs developed this way will be more effective, will have fewer side effects, and will be faster and cheaper to develop than conventional treatments because they sometimes incorporate already approved medicines. But it won’t be easy: there are large gaps in biological knowledge, and many developers are still heavily geared toward supporting the single-target, reductionist approach. “This is a difficult time for the field, which is under a lot of pressure to rapidly deliver new, safe, efficient and affordable drugs,” says Daniel Cohen, head of Pharnext. “It is hard to question the current single-target paradigm, which has probably reached its limits.

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Cancer drugs find a companion with new diagnostic tests

By Charlotte Schubert

When Stephen Little co-founded a molecular diagnostics company in 2001, he gave numerous presentations to pharmaceutical companies touting the benefits of tests that can tell which patients are likely to respond to a particular therapy or experience side effects. But most drugmakers were focused on blockbusters, and, since these so-called ‘companion diagnostics’ divide patient populations into smaller groups, they threatened to contract, not expand, their markets. As such, Little recalls, “there was not a great deal of enthusiasm.”

Ten years later, the tide has changed for Little and the field of companion diagnostics. In 2009, Little’s company, Manchester, UK–based DxS, was bought by the Dutch technology company Qiagen, where Little now serves as vice president of personalized health care. Qiagen currently has partnerships with more than 15 pharmaceutical companies, including, most recently, an agreement announced last month with Eli Lilly to develop a PCR-based test to detect mutations in the gene encoding Janus kinase 2 and thereby identify individuals with blood cancer who are likely to respond to a drug in early-stage development at the Indiana-based company.

This deal follows less than a month after the US Food and Drug Administration (FDA) approved two cancer drugs—Zelboraf (vemurafenib) for BRAF-mutation–positive metastatic melanoma on 17 August, and, a week later, Xalkori (crizotinib) for people with non–small-cell lung cancer driven by an ALK (anaplastic lymphoma kinase) fusion gene—together with their companion diagnostic tests. Notably, these two drug-diagnostic combined approvals represent divergent development strategies on the part of big pharma. The test accompanying Roche’s Zelboraf was developed in house at the Swiss drug giant’s diagnostics arm, Roche Molecular Diagnostics in Pleasanton, California. In contrast, New York–based Pfizer’s Xalkori comes with a diagnostic developed with Abbott Molecular of Des Plaines, Illinois.

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Biomedicine in Brazil: A special news focus

largecover.gifBrazil may best be known for Carnival celebrations, golden-sand beaches and soccer players who go by one name — but research into disease therapeutics is now also starting to put the country on the scientific map.

The number of biomedical publications with at least one Brazil-based author nearly tripled over the past decade, from around 4,500 papers in 2000 to close to 13,000 last year, according to data compiled for Nature Medicine by the University of São Paulo’s André Frazão Helene. And even though the country churns out only a little over 2% of the world’s biomedical output at present, that small number belies a larger trend toward innovative drug development and translational science.

This month, we have a seven-page special news section highlighting some of the strengths of Brazilian biomedicine and many of the challenges that lie ahead.

Laws hinder drug development inspired by Amazonian biodiversity

Brazilian drug companies hope to benefit from foreign investment

New framework needed to thwart Brazil’s crippling bureaucracy

In Brazil, basic stem cell research lags behind clinical trials

Brazilians lured back home with research funding and stability

After years of neglect, Brazil takes aim at Chagas disease

Hopes build that new infrastructure can aid drug discovery

Hard line take on public health gives Brazil soft political power

OPINION: The NIH translational research center might trade public risk for private reward

By Jerry Avorn and Aaron S. Kesselheim

As the US National Institutes of Health faces a $300 million budget reduction, it is creating a unit to facilitate the development of new drugs. The National Center for Advancing Translational Sciences (NCATS) envisioned by NIH Director Francis Collins would redeploy resources from the agency’s existing programs to identify discoveries that could be transformed into therapeutic products.

The road that brings treatments from bench to bedside is notoriously bumpy, and recent years have seen a scarcity of transformative medications and novel drug designs. Of the 47 new products approved in 2009–2010, by our count approximately two-thirds were members of an existing therapeutic class or managed their indicated condition about as well as available treatments. We clearly need more and better innovation.

The assumption underlying NCATS is that many potential drug targets or compounds have been identified but are not being adequately exploited, so the new NIH unit would pursue leads that drug companies or investors have overlooked or have chosen not to invest in. NCATS will also facilitate the exchange of ideas about common therapeutic approaches across different conditions by bringing together similarly oriented mechanism-based researchers currently separated in the NIH’s disease-specific institutes.

These plans raise important questions. Are there really many clinically promising compounds or targets that have been discovered but are languishing, neglected, in some laboratory—or that remain unexploited even though their properties are known? This may be true for some antibiotics, since the need for their restrained use makes them potentially unprofitable products for industry to develop. In such cases, the NCATS model could fill an important niche. But for treatments for conditions such as common cancers or Alzheimer’s disease, how likely is it that a new NIH center will be able to develop candidate therapies that armies of smart investigators, drug companies and venture capitalists have all somehow overlooked? It also isn’t clear that a governmental agency will generate more creative decision-making than the time-tested approach of investigator-initiated research.

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EDITORIAL: Drug targets slip-sliding away

Papers trumpeting new drug targets are a staple of biomedical journals such as Nature Medicine, but their claims are viewed skeptically by many drug development professionals. This skepticism has only been reinforced by a recent attempt to put some numbers on the reproducibility of such reports in a real-world setting (Nat. Rev. Drug Discov. 10, 712, 2011). The authors, from Bayer Healthcare, surveyed their in-house scientists tasked with experimentally validating publications on new drug targets. For only 21% of the 67 cases examined did they find results considered to be completely in line with the literature.

A reproducibility rate of 21% seems remarkably low, and the Bayer authors didn’t find any obvious trends to explain this. Given the limited information provided in their report, it’s difficult to make an independent evaluation of their findings, and a more fine-grained look at each of the cases might yield further insights. Notably, 70% of the cases examined involved oncology drug targets, so the situation might be different in other therapeutic areas.

Why should published research on new drug targets be so challenging to replicate? Although it doesn’t seem plausible that outright fraud could account for a high fraction of the failure rate, less serious forms of bias—so-called ‘questionable research practices’, such as selective presentation of data—are likely a more pervasive problem (see PLoS ONE 4, e5738, 2009). Statistical errors made by authors, such as the use of insufficient sample sizes, may arise simply from ignorance but have the potential to undermine the conclusions of many papers. Even a basic statistical procedure—comparing the difference between two experimental effects—is widely botched (Nat. Neurosci. 14, 1105, 2011).

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Patent protection brings hope to insurers

By Georgina Kenyon

Insurance companies are stepping up their marketing of damage-protection products to pharmaceutical and life science companies, some say in response to a June report by the US Food and Drug Administration laying out a collaborative strategy to more closely track the quality of goods globally.

In response to increasing regulatory activity, UK-based JLT Specialty, part of the Jardine Lloyd Thompson Group, has begun marketing such ‘nondamage’ products more aggressively this past summer—and they’re dropping their prices.

The price of the insurance depends on a variety of conditions—for instance, the size of the company seeking insurance, the limits bought and the triggers chosen. However, over the past year the cost of coverage has dropped more than threefold, from approximately 5% to 1.5% of the estimated coverage. For example, previously, $5 million could have covered a company worth $100 million, whereas now it costs $1.5 million to cover the same-sized company.

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OPINION: Consistent clinical research standards benefit patients around the world

By Joe Herring

joeherring.jpgAlthough the globalization of clinical trials has provided benefits to host countries, critics have focused on the rare but egregious examples of unethical practices. But large, coordinated trials by the contract research industry can encourage best practice, particularly if local countries adopt more consistent standards and oversight.

As economic prosperity comes to developing nations, diseases associated with Western lifestyles, such as cancer and diabetes, are crossing borders. Meanwhile, developing countries are quickly becoming consumers of biopharmaceutical products. With the shared burden of disease comes the need to obtain safety and efficacy profiles across worldwide populations in a way that mirrors global disease epidemiology and treatment.

Increasing access to allow for more people to participate will be instrumental in clinical trials of the future. Developed nations are home to just 15% of the world’s population, yet they host three-quarters of all clinical trials. Clinical trials in emerging regions tend to take place in large urban centers where healthcare infrastructure can support research conducted according to Good Clinical Practice (GCP) and International Conference on Harmonization (ICH) standards. Compliance to these industry standards will strengthen the safety and quality of the research and increase public confidence in clinical trial participation.

Without further globalization, the pace of medical research would slow substantially. This is largely due to the reality that clinical trials are larger and more complex than they were ten years ago, and Western participation levels have peaked.

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Joe Herring is chairman and chief executive officer of Covance, headquartered in Princeton, New Jersey, USA. Currently, he also serves as chairman of the board of the Washington, DC–based Association of Clinical Research Organizations.

French law to make conflict of interest disclosure mandatory

By Sabine Louët

France, still reeling from the Mediator scandal in which the diabetes drug (also known by its generic name, benfluorex) remained on the market until November 2009 despite earlier indications that it carried a risk of fatal heart valve trouble, is contemplating a revamp of its drug approval system. Lawmakers are due to discuss updates to the rules governing disclosures of conflict of interests by experts involved in the country’s drug approval process when the French National Assembly reconvenes at the end of September.

As part of a draft bill reforming the drugs approval and safety system, France may soon require that conflicts are publicly disclosed by directors and experts at regulatory agencies and made available publicly. Failure to do so would now incur sanctions including fines of up to €30,000 ($43,000).

Etienne Caniard, president of Mutualité Française, a federation of most of France’s nonprofit private health insurers, contends that the new rules will have a positive effect. “This proposal will help uncover the sectors where the state has given free rein to the pharmaceutical industry and where it should take its responsibility and regain control, such as continuous medical education,” he says.

To gain a clean start, the new bill also suggests renaming the country’s drug regulatory authority, from the French Health Products Safety Agency (AFSSAPS) to the National Agency for Medicine Safety (ANSM). The legislation would also make the renamed agency’s drug approval committees smaller than before to ensure that only experts with a track record in relevant therapeutic areas are involved. These experts would not be allowed to sit on drug approval committees longer than four or five years, and the decisions made by the committees would be more transparent.

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Q&A: Microbiologist takes helm of the European Institute of Innovation and Technology

vongabain913.jpgAlthough many of the world’s best known drugmakers hail from Europe, historically the continent’s academic institutions haven’t been as adept as their US counterparts at spinning off companies. So, in 2008, the European Commission founded the European Institute of Innovation and Technology (EIT) to bring technology and ideas developed at universities to market.

The EIT was modeled after the Massachusetts Institute of Technology in Cambridge—but it doesn’t bring its students and researchers to a common location. Instead, EIT-funded projects are based within virtual Knowledge and Innovation Communities (KICs) spread across the continent. So far, the institute has established three subject-specific KICs focused on climate change, sustainable energy and information technology, with a total of 75 collaborating universities, companies and other investors.

On 15 September, microbiologist Alexander von Gabain will take over from physicist and founding chairman Martin Schuurmans as head of the EIT. A professor at the Max Perutz Laboratories in Vienna and a cofounder of the Austrian biotech Intercell, von Gabain brings with him a new focus on advancing biomedical innovations at the institute. Hannah Waters spoke with him about how he plans to move the EIT into the biomedical arena.

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FDA reorganization inspires hope for better coordination

By Mike May

In an agency-wide e-mail message on 13 July, US Food and Drug Administration Commissioner Margaret Hamburg unveiled a massive reorganization of the regulatory watchdog’s 41-year-old management structure. “The most obvious change you will see,” she wrote, “is that the Agency’s programs, in terms of a reporting chain to me, will be divided into ‘directorates’ that reflect the core functions and responsibilities of the Agency.” In addition to the existing offices, she said the FDA would also create a new Office of Operations as well as a deputy commissioner for Global Regulatory Operations and Policy “focused on grappling with the truly global nature of today’s world.”

For the pharmaceutical industry, the most important change could be the addition of the Office of Medical Products and Tobacco, which will be directed by Stephen Spielberg, who will assume the new post by the end of September. Speilberg is tasked with helping to coordinate work across the FDA’s centers for drug, biologics, medical devices and tobacco products. In the past, each of these centers reported directly to the commissioner.

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