Trial to resolve all claims in the Anaptys and Tesaro/GSK dispute is scheduled for July 14-17, 2026 SAN DIEGO, Jan. 08, 2026 (GLOBE NEWSWIRE) -- AnaptysBio, Inc. (Nasdaq: ANAB), a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics, filed a partial motion to dismiss Tesaro’s anticipatory breach of contract claim in Delaware Chancery Court related to pending litigation between Anaptys, GSK, and TESARO, Inc. (“Tesaro”) regarding their Collaboration and Exclusive Licen ...

Trial to resolve all claims in the Anaptys and Tesaro/GSK dispute is scheduled for July 14-17, 2026 SAN DIEGO, Jan. 08, 2026 (GLOBE NEWSWIRE) -- AnaptysBio, Inc. (Nasdaq: ANAB), a clinical-stage biotechnology company focused on delivering innovative immunology therapeutics, filed a partial motion to dismiss Tesaro’s anticipatory breach of contract claim in Delaware Chancery Court related to pending litigation between Anaptys, GSK, and TESARO, Inc. (“Tesaro”) regarding their Collaboration and Exclusive Licen ...

Core Viewpoint - GSK's subsidiary, Tesaro Inc., has initiated litigation against AnaptysBio, claiming a material breach of their existing license agreement regarding the oncology treatment Jemperli (dostarlimab) [1][2][3] Group 1: Litigation Details - The litigation allows Tesaro to terminate the current license agreement, obtain a perpetual and irrevocable license to dostarlimab, and reduce royalties and milestone payments to AnaptysBio by 50% [3] - AnaptysBio has alleged that Tesaro has not fulfilled certain requirements of the license agreement from March 2014 and intends to revoke Tesaro's license for dostarlimab [4][5] - The original agreement included an upfront license fee of $17 million and milestone payments of $18 million per development program, with additional payments tied to regulatory submissions [5] Group 2: Financial Implications - AnaptysBio anticipates ending 2025 with approximately $300 million in cash and investments, including a potential $75 million milestone from GSK once Jemperli achieves $1 billion in worldwide net sales [8] - AnaptysBio has authorized a stock repurchase plan of up to $100 million [7] Group 3: Product and Market Context - Jemperli is approved in over 35 countries for certain endometrial cancers, which is the most common gynecologic cancer in the U.S. [6] - A clinical trial program is ongoing to evaluate dostarlimab's potential use in additional cancers, including rectal, colon, and head and neck cancers [6]

Core Viewpoint - AnaptysBio has filed a Verified Complaint against Tesaro and GSK, alleging material breaches of their Collaboration Agreement and seeking legal remedies [1][2]. Group 1: Legal Disputes - Anaptys claims that Tesaro breached the Collaboration Agreement by participating in clinical trials with competing PD-1 antagonists and failing to use reasonable efforts to maximize commercial returns for Jemperli [2]. - Tesaro has initiated its own lawsuit against Anaptys, alleging that Anaptys improperly claimed breaches of the Collaboration Agreement [4]. - The parties are seeking an expedited trial schedule in Delaware Chancery Court, with a trial expected in July 2026 [5]. Group 2: Financial Implications - Anaptys is entitled to royalties from Jemperli sales, structured as 8% for net sales below $1 billion, 12% for sales between $1 billion and $1.5 billion, 20% for sales between $1.5 billion and $2.5 billion, and 25% for sales above $2.5 billion [7]. - A one-time $75 million commercial sales milestone is anticipated once Jemperli achieves $1 billion in worldwide net sales [7]. - Anaptys estimates that Sagard will accrue $250 million in royalties and sales milestones through the end of 2025, with full paydown expected between Q2 2027 and Q2 2028 [9]. Group 3: Background of the Collaboration - The Collaboration Agreement was established in March 2014, allowing Tesaro to develop Jemperli for various solid tumor indications [6]. - Anaptys previously filed a complaint against GSK in 2020 regarding breaches related to GSK's clinical trial of Zejula, which resulted in a settlement that included cash payments and increased royalties on Jemperli [3]. Group 4: Company Overview - AnaptysBio is a clinical-stage biotechnology company focused on innovative immunology therapeutics for autoimmune and inflammatory diseases, with a pipeline that includes multiple therapeutic candidates [10]. - The company plans to separate its biopharma operations from its royalty assets by the end of 2026 to better align with investor interests [11].