Issued: 13 May 2025, London UK

GSK provides update on belrestotug development programme

GSK plc (LSE/NYSE: GSK), with its development partner iTeos Therapeutics, Inc., has confirmed it is ending the development programme for belrestotug, an anti-TIGIT monoclonal antibody. The decision is based on new interim analyses from the phase 2 GALAXIES Lung-201 and GALAXIES H&N-202 studies, which did not meet the established efficacy criteria for continued development. As a result, the collaboration and all belrestotug-containing study cohorts are ending.

GSK in Oncology

Our ambition in oncology is to help increase overall quality of life, maximise survival and change the course of disease, expanding from our current focus on blood and women's cancers into lung and gastrointestinal cancers, as well as other solid tumours. This includes accelerating priority programmes such as antibody-drug conjugates targeting B7-H3 and B7-H4, and IDRX-42, a highly selective KIT tyrosine kinase inhibitor.

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Cautionary statement regarding forward-looking statements

GSK cautions investors that any forward-looking statements or projections made by GSK, including those made in this announcement, are subject to risks and uncertainties that may cause actual results to differ materially from those projected. Such factors include, but are not limited to, those described in the "Risk Factors" section in GSK's Annual Report on Form 20-F for 2024, and GSK's Q1 Results for 2025.

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