Merck (MRK) Stock Soars 10% as Cancer Vaccine Delivers a Historic First

NewsWed, 19 Aug 2026 13:41:14 UTC1 hour ago
Merck (MRK) Stock Soars 10% as Cancer Vaccine Delivers a Historic First

TLDR

  • Merck and Moderna’s Phase 3 INTerpath-001 trial met its primary endpoint of recurrence-free survival in melanoma patients
  • The trial enrolled 1,137 high-risk Stage IIB-IV melanoma patients and is the first large-scale Phase 3 win for mRNA-based cancer vaccines
  • MRK stock hit a new 52-week high of $143.52 in premarket trading, up around 10%
  • Moderna surged over 90% premarket, trading at $118.61
  • Barclays analysts estimate the therapy could generate around $3 billion in melanoma sales by 2035

Merck stock jumped roughly 10% in premarket trading on Wednesday after the company and Moderna announced a major clinical win for their personalized mRNA cancer vaccine.



Merck & Co., Inc., MRK

The Phase 3 INTerpath-001 trial of Intismeran autogene, combined with Keytruda, met its primary endpoint of recurrence-free survival and the secondary endpoint of distant metastasis-free survival in patients with completely resected Stage IIB-IV melanoma.

MRK hit $143.52 in premarket trade, a new 52-week high, clearing the prior ceiling of $137.98.

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