Incyte Corp.’s retifanlimab-dlwr received its first regulatory nod on March 22, with the U.S. FDA granting accelerated approval for the PD-1 inhibitor to treat adults with a rare form of skin cancer, advanced Merkel cell carcinoma.
Concerns voiced during January’s U.S. FDA advisory committee meeting failed to deter Cidara Therapeutics Inc. from winning approval by the agency March 22 for once-weekly Rezzayo (rezafungin for injection) to treat a pair of indications – candidemia as well as invasive candidiasis (IC) – in adults with limited or no alternatives.
Despite a failed phase III study, the U.S. FDA suggests in briefing documents that tofersen (BIIB-067) is effective for treating the rare, genetic disease superoxide dismutase 1 amyotrophic lateral sclerosis (ALS). The intrathecally injected therapy is being developing by Biogen Inc. and Ionis Pharmaceuticals Inc. and is at the heart of a March 22 meeting of the agency’s Peripheral and Central Nervous System Drugs Advisory Committee (adcom).
Acadia Pharmaceuticals Inc. will make available by the end of this month Daybue (trofinetide), a synthetic analogue of the amino‐terminal tripeptide of IGF-1 for Rett syndrome (RS), which was greenlighted by the U.S. FDA March 10 and remains in the works for fragile X syndrome as well as undisclosed other indications.
Pricing won’t be known until later for Pfizer Inc.’s Zavzpret (zavegepant), which became the first and only calcitonin gene-related peptide receptor antagonist nasal spray approved by the U.S. FDA for acute treatment of migraine with or without aura in adults. The product is slated to launch this summer. Meanwhile, Wall Street has questions about New York-based Pfizer’s performance in the migraine space.
The U.S. FDA has accepted Mesoblast Ltd.’s BLA resubmission for its allogeneic stem cell treatment remestemcel-L in children with steroid-refractory acute graft-vs.-host disease (SR-aGVHD). Mesoblast received a complete response letter from the FDA in October 2020 for remestemcel-L even though approval was highly anticipated after the FDA’s Oncologic Drugs Advisory Committee voted 9-1 that the stem cell therapy showed evidence of efficacy as a treatment for SR-aGVHD in children.
Noting that the FDA had rejected its previous proposal last year to voluntarily withdraw Makena from the U.S. market, Covis Pharma BV is again offering to voluntarily withdraw the drug, which is the only drug approved to reduce the risk of preterm birth. Along with its offer, the company asked the agency “to allow for an orderly wind-down that would best serve the interests of the patients,” according to a March 6 letter from Covis’ attorney to FDA Commissioner Robert Califf and Namandjé Bumpus, the agency’s chief scientist.
Shares of Veru Inc. hit a 52-week low March 3 after the U.S. FDA declined to grant an emergency use authorization (EUA) for sabizabulin for use in hospitalized adults with moderate to severe COVID-19 who are at high risk for acute respiratory distress syndrome. The decision comes as little surprise, given the negative advisory panel vote in November, but the agency’s wording might suggest potential use for the microtubule disruptor in the future.
The U.S. development path for rare disease treatments is strewn with numerous challenges, not least of which are the regulatory hurdles. For companies developing promising candidates to treat ultra-rare diseases and the patients who are running out of time, the regulatory obstacles in the U.S. may seem almost insurmountable. And new concerns about drug development in general could make those barriers even higher.
Although the U.S. FDA’s Vaccines and Related Biological Products Advisory Committee (VRBPAC) voted unanimously, 12-0, March 1 that the data GSK plc presented was adequate to support the safety of its respiratory syncytial virus vaccine, several panelists cautioned the FDA against viewing the vote as a recommendation to license the vaccine before more data are available.
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