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BioNTech's colorectal cancer vaccine trial fails, shares drop 8%, Moderna down 6%, Pfizer steady.

Market News
28 Aug 2026
24/7 Wall Street
View Source
Bearish
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BioNTech halted its Phase 2 trial for a colorectal cancer vaccine after a Data Safety Monitoring Board found no efficacy, causing its stock to fall 8%. This setback also pressured Moderna's shares, which dropped 6%, despite its recent melanoma vaccine success. Pfizer's stock remained mostly unaffected due to its diversified portfolio and recent FDA approval for a COVID-19 vaccine update. The failure highlights challenges for mRNA vaccines in treating immunotherapy-resistant tumors and prompts investors to reassess the potential of mRNA cancer therapies. Upcoming trial results and industry data may clarify the future outlook for these treatments.

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