Mon, Dec 03, 2012 - Page 9 News List

Research innovations demand new drug-development process

By Alasdair Breckenridge

The harmful effects of medicines capture headlines worldwide. After all, horror stories about “killer drugs” are easy to sell. However, while drugs’ damaging effects are a legitimate cause for concern, they do not necessarily constitute a serious public health issue, provided that they are outweighed by the benefits they confer.

Drugs with serious adverse safety profiles are used to treat potentially fatal conditions — including various forms of cancer, inflammatory arthritis and HIV — because they ultimately help more than they hurt. Rather than assess a medicine’s safety in isolation, its adverse effects must be considered in relation to its efficacy. In other words, a benefit-risk balance must be struck.

However, getting this message across to the public has proven to be difficult. Successful drug treatment and disease prevention can fail to capture the attention of readers or voters. Moreover, drug safety is a leading factor in determining how medicines are regulated.

In 1961, thalidomide, a hypnotic drug also used to treat nausea in pregnant women, was found to have caused severe birth defects in more than 10,000 children in 46 countries since its introduction four years earlier. In the tragedy’s wake, drug-development processes were adjusted in order to bolster medicines’ safety profile.

As a result, many of the most widely prescribed drugs today were subject to a long process of preclinical experimentation, followed by clinical studies that lasted several years and cost millions of dollars, before gaining regulators’ approval.

However, this development model is no longer sustainable. Not only is it expensive and slow, but it also has been unproductive. Between 2001 and 2002, the pharmaceutical sector has spent US$1.1 trillion on research and development, but the 12 largest companies have received regulatory approval for only 139 new molecular compounds.

However, things are changing. Doctors and their patients are now eager to gain early access to biopharmaceutical medicines — a new variety of injectable drugs, including proteins, nucleic acids and vaccines that are produced using biotechnology. Such drugs have the realistic potential to cure forms of cancer and autoimmune diseases rather than merely treat the symptoms of disease. So access is requested earlier than the regulator normally allows in the licensing process. This poses a dilemma, because regulators are concerned about the lack of safety information about these new drugs.

However, that concern might be as unnecessary as it is inhibiting. New models of so-called adaptive licensing, or conditional approval, are being used to balance patients’ needs with regulators’ caution. Patients with serious conditions can gain early access to promising drugs before they are fully licensed. In exchange, they are subjected to rigorous evaluation to assess the drug’s safety and effectiveness for general use.

The adaptive licensing model thus recasts drug licensing as a more fluid process, based on the benefit-risk ratio. Rather than determining simply whether the drug is effective or has unwanted side-effects, it aims to appraise the benefits and risks in view of the patient’s specific needs.

The price of medicines has become increasingly important as the cost of developing new medicines such as biopharmaceuticals has risen. In the UK, a biologically-based drug costs, on average, £9,500 (US$15,200) per patient annually, compared to £450 for conventional drug treatment.

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