Spectrum Pharmaceuticals Inc. president and CEO Tom Riga said the company would "immediately deprioritize" its poziotinib program after the U.S. FDA issued a complete response letter (CRL) suggesting the company would have to generate new clinical data prior to potential approval.
Ardelyx Inc. could have a rocky row to hoe when it makes its case for tenapanor, as a hyperphosphatemia therapy in adults with chronic kidney disease, before the U.S. FDA’s Cardiovascular and Renal Drugs Advisory Committee Nov. 16. The big question facing the adcom is whether the change in baseline serum phosphorous levels achieved by the drug is clinically meaningful. Clearly, FDA reviewers don’t think so, as that question already has resulted in delayed PDUFA dates, a complete response letter and two formal dispute resolution requests.
The U.S. FDA declined to approve Gilead Sciences Inc.’s Hepcludex (bulevirtide), issuing a complete response letter (CRL) citing manufacturing and delivery concerns for the antiviral aimed at treating confirmed chronic hepatitis delta virus (HDV) infection in adults with compensated liver disease. Acquired in Gilead’s 2021 buyout of Myr GmbH, Hepcludex received conditional approval from the European Commission in 2020 and would have been the first drug cleared for HDV in the U.S. Its delay, however, could give a boost to Eiger Biopharmaceuticals Inc., which is expected to report phase III data for lonafarnib by the end of 2022.
With four complete response letters behind it and seven months ahead of its April 2023 PDUFA date, Mallinckrodt plc’s Terlivaz (terlipressin) has been approved by the U.S. FDA for treating hepatorenal syndrome. Terlivaz had a decade-long series of obstacles before getting the long-awaited approval. The vasopressin analogue selective for V1 receptors was approved, in part, on results from the phase III CONFIRM trial of 300 patients, which met its primary endpoint of renal function improvement, avoidance of dialysis and short-term survival (p=0.012).
