HUTCHMED Highlights Clinical Data to be Presented at the 2024 ASH Annual Meeting and the 2024 ESMO Asia Congress Hong Kong, Shanghai & Florham Park, NJ - Wedne sday, November 6 , 2024: HUTCHMED (China) Limi

HUTCHMED Highlights Clinical Data to be Presented at the 2024 ASH Annual Meeting and the 2024 ESMO Asia Congress

Hong Kong, Shanghai & Florham Park, NJ - Wednesday, November 6, 2024: HUTCHMED (China) Limited ("HUTCHMED") (Nasdaq/AIM:HCM; HKEX:13) today announces that new and updated data from the sovleplenib ESLIM-01 Phase III trial, as well as several investigator-initiated studies of compounds discovered by HUTCHMED will be presented at the American Society of Hematology ("ASH") Annual Meeting taking place on December 7-10, 2024 in San Diego, USA, and the European Society for Medical Oncology ("ESMO") Asia Congress 2024, taking place on December 6-8, 2024 in Singapore.

Long-term safety and efficacy data from a follow-on, open-label sub-study of the extension stage of ESLIM-01 Phase III study of sovleplenib in adult patients with chronic primary immune thrombocytopenia ("ITP") in China will be reported at the 2024 ASH Annual Meeting (NCT05029635). At data cut-off on January 31, 2024, a total of 179 patients were treated with at least one dose of sovleplenib. 55.3% (99/179) of the patients were still on the treatment in the sub-study, with a median duration of exposure of 56.6 weeks.

The follow-on sub-study data demonstrated that long-term treatment with sovleplenib was effective in increasing and maintaining platelet count in adults with chronic primary ITP in China. In the overall population, the overall response was achieved by 81% (145/179) of the patients, with a durable response rate of 51.4% and long-term durable response rate of 59.8%. The median cumulative duration of platelet count 50 10 /L was 38.9 weeks. The long-term treatment was well tolerated, with a safety profile consistent with previous studies and no new safety signals were identified.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the "safe harbor" provisions of the U.S. Private Securities Litigation Reform Act of 1995. These forward-looking statements reflect HUTCHMED's current expectations regarding future events, including but not limited to its expectations regarding the therapeutic potential of fruquintinib, savolitinib, sovleplenib and surufatinib, the further clinical development for fruquintinib, savolitinib, sovleplenib and surufatinib, its expectations as to whether any studies on fruquintinib, savolitinib, sovleplenib and surufatinib, would meet their primary or secondary endpoints, and its expectations as to the timing of the completion and the release of results from such studies. Such risks and uncertainties include, among other things, assumptions regarding enrollment rates and the timing and availability of subjects meeting a study's inclusion and exclusion criteria; changes to clinical protocols or regulatory requirements; unexpected adverse events or safety issues; the ability of fruquintinib, savolitinib, sovleplenib and surufatinib, including as combination therapies, to meet the primary or secondary endpoint of a study, to obtain regulatory approval in different jurisdictions and to gain commercial acceptance after obtaining regulatory approval; the potential markets of fruquintinib, savolitinib, sovleplenib and surufatinib for a targeted indication, and the sufficiency of funding. In addition, as certain studies rely on the use of serplulimab, sintilimab, S-1, temozolomide and bevacizumab as combination therapeutics, such risks and uncertainties include assumptions regarding their safety, efficacy, supply and continued regulatory approval. Existing and prospective investors are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. For further discussion of these and other risks, see HUTCHMED's filings with the U.S. Securities and Exchange Commission, The Stock Exchange of Hong Kong Limited and on AIM. HUTCHMED undertakes no obligation to update or revise the information contained in this press release, whether as a result of new information, future events or circumstances or otherwise.

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