The appointment May 6 of Vinay Prasad as the head of the U.S. FDA’s Center for Biologics Evaluation and Research (CBER) “bodes poorly” for Sarepta Therapeutics Inc.’s development-stage pipeline, said Wainwright analyst Mitchell Kapoor – and Wall Street reflected as much, as the stock (NASDAQ:SRPT) ended that day down 26.6% vs. an XBI drop of 6.6% – this ahead of the after-hours earnings disclosure that pushed the Cambridge, Mass.-based firm down even farther by more than another 20%, with the XBI unchanged.
Wall Street was weighing the gravity of the death from acute liver failure of a patient who was treated for Duchenne muscular dystrophy (DMD) with Sarepta Therapeutics Inc.’s gene therapy, Elevidys (delandistrogene moxeparvovec). Liver injury is a known possible side effect of the product, first approved by the U.S. FDA in June 2023 for DMD, as well as other AAV-mediated gene therapies, and the potential problem is highlighted in Elevidys’ prescribing information.
In the largest collaboration of 2024, Sarepta Therapeutics Inc. and Arrowhead Pharmaceuticals Inc. entered a sprawling global licensing deal that includes a swath of clinical and preclinical candidates targeting rare genetic diseases. Under the terms, Sarepta gains access to existing and potential future compounds derived from the RNAi platform developed by Arrowhead, with the latter eligible for payments potentially exceeding $11 billion.
While Dyne Therapeutics Inc.’s DYNE-251 demonstrated high levels of dystrophin expression and functional improvement in boys with Duchenne muscular dystrophy who are amenable to exon 51 skipping, investors focused on three serious adverse events related to the drug, driving shares (NASDAQ:DYNE) down by 31% on Sept. 3.
Sarepta Therapeutics Inc. CEO Douglas Ingram said he expects “ferocious” demand for gene therapy Elevidys (delandistrogene moxeparvovec), granted full approval by the U.S. FDA for Duchenne muscular dystrophy (DMD). Shares of the Cambridge, Mass.-based firm closed June 21 at $16.72, up $37.22, or about 30% on the news.
The good news for Sarepta Therapeutics Inc. is bad news for Pfizer Inc. as the phase III study of its mini-dystrophin gene therapy in Duchenne muscular dystrophy (DMD) has missed its primary endpoint. Now Sarepta’s Elevidys (delandistrogene moxeparvovec), a single-dose, adeno-associated virus-based gene transfer therapy for DMD, is barreling toward a June 21 PDUFA date with the U.S. FDA as the near competition shrinks in the rearview mirror.
A boy participating in the phase II Daylight study of Duchenne muscular dystrophy (DMD) “has passed away suddenly,” according to Pfizer Inc. The participant had received fordadistrogene movaparvovec, a mini-dystrophin gene therapy, in early 2023. The fatal serious adverse event was reported May 3 as a cardiac arrest, Pfizer told BioWorld. Pfizer, together with the independent external data monitoring committee, is reviewing the data to understand the potential cause, the company added.
The U.S. FDA has approved Duvyzat (givinostat), from Italfarmaco SpA, for treating Duchenne muscular dystrophy (DMD). It is the first oral, nonsteroidal drug for treating all of DMD’s genetic variants. The oral treatment is approved for those ages 6 and older.
Sarepta Therapeutics Inc.’s next-generation peptide-conjugated PMO therapy, SRP-5051 (vesleteplirsen), looks set to stake its claim in the Duchenne muscular dystrophy (DMD) space, as phase II data unveiled dystrophin expression that outperforms first-generation exon-skipping drug Exondys 51 (eteplirsen). The question is what that space might look like in the wake of a U.S. FDA decision whether to expand labeling and convert to full approval Sarepta’s DMD gene therapy, Elevidys (delandistrogene moxeparvovec).
“This is a tough business. It’s never a straight line from start to success.” Those words, from Exelixis Inc. CEO Michael Morrissey, during a presentation at the J.P. Morgan Healthcare Conference (JPM), could easily sum up any aspect of the biopharma industry. But with more biopharma firms than ever having reached commercial status, along with the introduction of new therapeutic modalities into the health care market, many are finding the toughest part comes after regulatory approval, whether it’s navigating a competitive landscape, getting payers and physicians on board, or satisfying regulators’ stringent postmarketing requirements. As industry players and observers head home after a busy week in San Francisco, BioWorld offers a brief glimpse at a few firms taking on those post-approval challenges in 2024.
