Clinical Data to be Presented at ASH and ESMO Asia

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 ≥50×10⁹/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.

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