Sionna Therapeutics, Inc. Common StockLead drug SION-719 failed Phase 2a trial, program discontinued.
Sionna Therapeutics shares plunged more than 90% after its lead cystic fibrosis drug candidate SION-719 failed a Phase 2a trial, while Vertex Pharmaceuticals surged to new highs as a key competitive threat was removed. The trial, which tested SION-719 as an add-on to Vertex’s blockbuster Trikafta regimen, did not meet its main activity endpoint, and Sionna will not advance the program. Sionna will now prioritize an earlier-stage SION-451 combo program, but with over $268 million in cash and its lead asset shelved, the stock’s valuation was heavily dependent on SION-719. Vertex, already trading near record levels after raising full-year revenue guidance and proposing a $10 billion acquisition of Crinetics Pharmaceuticals, saw its cystic fibrosis dominance further de-risked.
Sionna Therapeutics, Inc. Common StockLead drug SION-719 failed Phase 2a trial, program discontinued.
Vertex Pharmaceuticals IncCompetitor's drug failure removes threat to Vertex's CF franchise.
Crinetics Pharmaceuticals IncVertex proposed acquiring Crinetics, but the deal is not final and impact on Crinetics is unclear.