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flag AnaptysBio and Tesaro (GSK) sue each other over Jemperli drug rights, with trial set for July 2026.

flag AnaptysBio has sued Tesaro, a GSK subsidiary, over alleged breaches of their 2014 agreement for the cancer drug Jemperli, claiming Tesaro violated exclusivity and failed to maximize commercial success. flag Tesaro countersued, alleging AnaptysBio breached the agreement by asserting those violations, seeking to terminate the license, secure a perpetual right to Jemperli, and cut royalties by 50%. flag Both sides agree to an expedited trial set for July 2026. flag Jemperli, approved in over 35 countries, is under active development for other cancers, with royalty payments due during litigation.

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