** Shares of drug developer Summit Therapeutics SMMT.O rise 3.71% to $16.22 premarket
** Co says the U.S. Food and Drug Administration has accepted its application to market its experimental drug to treat lung cancer
** Reports mixed results from patient subgroups in a longer-term follow-up of its late-stage trial in September
** The therapy is an antibody designed to block a protein called PD-1, which helps the body's immune system fend off cancer; Keytruda also targets the same protein
** The health regulator has assigned a new Prescription Drug User Fee Act (PDUFA) target action date for November 14, 2026 - SMMT
** Stock fell ~2% in 2025
(Reporting by Gnaneshwar Rajan in Bengaluru)
((Gnaneshwar.Rajan@thomsonreuters.com;))
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