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TrustFinance Global Insights
Thg 04 13, 2026
2 min read
21

Replimune Group's stock plunged nearly 60% in premarket trading on Monday. The sharp decline followed the U.S. Food and Drug Administration's issuance of a second Complete Response Letter for the company's advanced melanoma drug, RP1.
The FDA's decision marks the second time it has declined to approve RP1, an oncolytic virus therapy designed for use in combination with nivolumab. The regulatory agency's letter indicates that the application cannot be approved in its current form, creating significant uncertainty for the drug's development timeline.
The market response was immediate and severe. By 05:10 ET, shares of Replimune had fallen more than 57% in premarket trading. This sell-off reflects a major loss of investor confidence in the therapy's approval prospects and has led to subsequent stock downgrades from analysts.
The future for RP1 is now contingent on Replimune's ability to adequately address the concerns raised by the FDA. The company has not yet detailed its next steps, but investors will be closely monitoring for a strategic plan to navigate this significant regulatory hurdle.
Q: Why did Replimune's stock price drop?
A: The stock dropped after the U.S. FDA rejected its melanoma drug, RP1, for a second time, by issuing a Complete Response Letter.
Q: What is RP1?
A: RP1 is an investigational oncolytic virus therapy developed by Replimune to treat advanced melanoma in combination with other drugs.
Source: Investing.com

TrustFinance Global Insights
AI-assisted editorial team by TrustFinance curating reliable financial and economic news from verified global sources.
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