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May 4, 2026

FDA Rejects Promising Melanoma Drug RP1 Twice, Raising Concerns About Drug Approval Process

The FDA has rejected RP1, a breakthrough melanoma treatment, twice despite its promise in treating skin cancer. The rejections have left medical professionals puzzled and concerned about implications for future drug approvals.

May 4, 2026·1 source
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Top claims

  • ▪RP1 is an oncolytic immunotherapy drug made of an engineered modified herpesvirus.
  • ▪Replimune Group laid off employees working on RP1 marketing and manufacturing in April following the rejections.
  • ▪2.2 percent of people will be diagnosed with melanoma at some point during their life.

Topics

Drug approval processCancer treatmentHealthcare Policy

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