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GSK's TESARO wins partial dismissal in dostarlimab license dispute with AnaptysBio

Market News
27 Apr 2026
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GSK's oncology unit TESARO achieved a partial legal win when a Delaware court dismissed AnaptysBio's counterclaim of anticipatory breach in their dispute over the dostarlimab cancer drug license. The court did not resolve the main contractual issues, and TESARO's claim for a declaratory judgment on their legal rights will continue to trial. The dispute arose from AnaptysBio's allegations that TESARO failed to meet certain license agreement terms from 2014, which GSK denies. Dostarlimab, marketed as Jemperli, is approved in over 35 countries for endometrial cancer and is seeing strong sales growth with ongoing trials for other cancer types.

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