MEDIOCRE METRICS: In the past seven years, the FDA has increased the number of neurological disease drugs approved under its accelerated approval pathway. Some of the drugs approved were the first treatments of their kind. But some experts fear this pathway — intended to get patients without options earlier access to new drugs — may not be helping patients. Accelerated approval relies on proxy, or alternative, metrics in early-stage clinical trials. If drugmakers can show that a new treatment improves a proxy metric that suggests potential patient benefits, the FDA can conditionally approve it to get it to patients sooner. For conditions like HIV or cancer, proxy metrics have been good predictors of a drug’s merit. But proxy metrics for neurological conditions are murkier. No causal relationships have been clearly established between some of the metrics and measurable patient improvement down the line. “You don’t have to have a Ph.D. in biostatistics to understand that just because ‘A’ and ‘B’ co-occur, it doesn’t mean A causes B,†said Dr. Caleb Alexander, a professor of epidemiology at Johns Hopkins Bloomberg School of Public Health. Drugmakers are required to conduct confirmatory trials to prove accelerated approval therapies work after they reach the market or risk the FDA revoking their approval. But the trials can take years to complete and are often delayed. Congress granted the FDA additional powers last year to pull unproven drugs from the market if manufacturers fail to provide additional evidence quickly enough. But the agency hasn’t put those powers into action. “We are considering our new statutory authorities and working to implement them,†Cherie Duvall-Jones, an FDA spokesperson, said. Patients without other options see drugs with expedited approvals as their only hope. Many of the diseases they treat are so rare and are fatal so quickly, it would be impossible to run a traditional clinical trial, said Paul Melmeyer, vice president of public policy and advocacy at the Muscular Dystrophy Association. “We don’t have existing options,†he said. IT’S FRIDAY. WELCOME BACK TO PRESCRIPTION PULSE. Your co-author is drafting his fantasy basketball team on Monday. Send news, tips and drafting tips to Lauren Gardner ([email protected] or @Gardner_LM), David Lim ([email protected] or @davidalim) and Katherine Ellen Foley ([email protected] or @katherineefoley). TODAY ON OUR PULSE CHECK PODCAST, host Kelly Hooper talks with Katherine about the FDA's accelerated approval process for neurological disease treatments and why some experts fear it can result in giving patients false hope.
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