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Novartis to Acquire Synnovation Therapeutics’ Pan-Mutant Selective PI3Kα Inhibitor Program

Novartis pays $2 billion upfront for SNV4818, a phase 1/2 pan-mutant selective PI3Kα inhibitor aiming for better tolerability and combination use in breast cancer treatment.

  • This year Novartis agreed to buy Synnovation Therapeutics' Pikavation Therapeutics and SNV4818, paying $2 billion upfront plus up to $1 billion in milestones with closing expected in the first half.
  • Clinical need for better-tolerated PI3K therapies is driven by roughly 40% of HR-positive, HER2-negative breast cancer patients harboring PIK3CA mutations and toxicity warnings limiting existing PI3Kα inhibitors.
  • Preclinical and early clinical data show SNV4818 has strong activity against PIK3CA mutations and is in a Phase 1/2 study with fulvestrant and palbociclib, results due 2027.
  • The move follows pressure on Piqray from Roche's Itovebi, and Novartis shares were down 1.02% at $146.68 at publication.
  • If trials succeed, SNV4818 could improve tolerability, enable earlier combinations, and expand options, aligning with Novartis' precision-medicine and oncology growth strategy including Kisqali.
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The business takes place less than a month after Novartis completes its larger purchase in a decade — purchase by the neuromuscular drug developer Avidity Biosciences per US$ 12 billion

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Business Wire broke the news in Crystal River, United States on Thursday, March 19, 2026.
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