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RCUS Discontinues Key Trial; Gilead Collaboration Ends

Apr 22, 2026, 3:41 PM EDT2 sourcesAI-analyzed

Why it may matterVerify against the original reporting

The cessation of a critical trial and loss of partnership with Gilead negatively impacts RCUS's outlook and potential revenue streams, reminiscent of past declines seen when pivotal studies fail.

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What happened, with direct paths to the underlying reporting

Arcus Biosciences has halted its Phase 3 STAR-121 study due to limited efficacy, and Gilead Sciences decided not to extend its collaboration rights, impacting future partnerships. Despite these setbacks, exploratory results suggest comparability in survival outcomes with current treatments, while Arcus retains control over some important programs.

RCUS halted Phase 3 STAR-121 trial due to low efficacy.
Gilead Sciences will not extend collaboration rights with Arcus.
Exploratory trials showed survival outcomes consistent with existing treatments.
Arcus retains rights to several key programs despite Gilead's exit.
RCUS stock rose 6.89%, nearing its 52-week high.

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