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Regeneron's melanoma drug trial misses key goal, triggering analyst downgrades.

Market News
18 May 2026
Proactive Investors
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Bearish
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Regeneron Pharmaceuticals' phase 3 trial for its melanoma drug fianlimab, combined with cemiplimab, failed to meet the primary goal of significantly improving progression-free survival compared to Merck's Keytruda. Although the combination extended median progression-free survival by 5.1 months, it narrowly missed statistical significance, raising doubts about its effectiveness. This setback led to analyst downgrades and follows earlier disappointing trial results in lung cancer. A separate trial comparing fianlimab to a rival drug continues, but the recent failure raises concerns about the drug's commercial future.

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