On May 17, 2024 HUTCHMED (China) Limited ("HUTCHMED") (Nasdaq/AIM:HCM; HKEX:13) reported that topline and subgroup results from the ESLIM‑01 Phase III study of sovleplenib, as well as new and updated data related to novel investigational hematological malignancy therapies HMPL-306, HMPL-760 and tazemetostat, will be presented at the upcoming European Hematology Association (EHA) (Free EHA Whitepaper) ("EHA") Hybrid Congress, taking place on June 13-16, 2024 in Madrid, Spain and online (Press release, Hutchison China MediTech, MAY 17, 2024, View Source [SID1234643409]).

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ESLIM-01 is a randomized, double-blinded, placebo-controlled Phase III trial in China of sovleplenib in adult patients with primary Immune Thrombocytopenia ("ITP") who have received at least one prior line of standard therapy (NCT05029635). In 188 patients randomized to receive oral sovleplenib or placebo, sovleplenib demonstrated a clinically meaningful early and sustained durable platelet response in patients with primary ITP with durable response rate of 48.4% compared to zero with placebo (p<0.0001). The median time to response was 1.1 weeks with sovleplenib. It demonstrated a tolerable safety profile with grade 3 or above treatment-emergent adverse events (TEAEs) in 25.4% of patients with sovleplenib and 24.2% with placebo. Sovleplenib also significantly improved quality of life in physical functioning and energy/fatigue (p<0.05).

Most patients were heavily pretreated with a median of four prior lines of ITP therapy and a majority (71.3%) of the patients had received prior TPO/TPO-RA[i] treatment. Further post-hoc subgroup analysis of the study demonstrated consistent clinical benefits across ITP patients regardless of prior lines of ITP therapies or prior TPO/TPO-RA exposure, regardless of TPO/TPO-RA treatment types and number of prior regimens.

In addition to the promising data in ITP, results from Phase II part of the ongoing ESLIM-02 Phase II/III study (NCT05535933) of sovleplenib for warm antibody autoimmune hemolytic anemia (wAIHA) will also be presented at the congress demonstrating encouraging hemoglobin (Hb) benefit compared with placebo, with overall response rate of 43.8% vs. 0% in the first 8 weeks, and overall response rate of 66.7% during the 24 weeks of sovleplenib treatment (including patients that crossed over from placebo). A favorable safety profile was also demonstrated.

Details of the presentations are as follows:

Abstract title Presenter / Lead author Presentation details
Efficacy and Safety of The Syk Inhibitor Sovleplenib (HMPL-523) in Adult Patients with Primary Immune Thrombocytopenia in China (ESLIM-01): A Randomized, Double-Blind, Placebo-Controlled Phase 3 Study Renchi Yang
Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China #S316
Oral Presentation (Platelet disorders in the spotlight: Clinical and translational)
Friday, June 14, 2024
15:00 – 15:15 CEST, Hall Mallo
Sovleplenib for the Treatment of Warm Antibody Autoimmune Hemolytic Anemia (wAIHA): Results from the Randomized, Double-Blind, Placebo-Controlled, Phase 2 Part of the Study Fengkui Zhang
Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China #S297
Oral Presentation (Thalassemias and rare anemias)
Sunday, June 16, 2024
12:00 – 12:15 CEST, Hall Mallo
Sovleplenib In Primary Immune Thrombocytopenia (ITP) Patients by Prior Lines of Therapy: Subgroup Analysis of a Multicenter, Randomized, Double-Blind, Placebo-Controlled Phase 3 Study (ESLIM-01) Xiaofan Liu
Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China #P1629
Poster Session
Friday, June 14, 2024
Sovleplenib In Primary Immune Thrombocytopenia (ITP) Pts with Prior TPO/TPO-RA Treatment: Subgroup Analysis of a Multicenter, Randomized, Double-Blind, Placebo-Controlled Phase 3 Study (ESLIM-01) Heng Mei
Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China #P1631
Poster Session
Friday, June 14, 2024
Safety and Efficacy of Syk Inhibitor Sovleplenib in Heavily Pre-Treated Hodgkin Lymphoma Patients Paolo Strati
The University of Texas MD Anderson Cancer Center, Houston, U.S. #P1102
Poster Session
Friday, June 14, 2024
HMPL-306 in Patients with Relapsed or Refractory Myeloid Hematological Malignancies Harboring IDH1 and/or IDH2 Mutations: Final Result of Dose Expansion in Phase 1 Study Xiaojun Huang
Peking University People’s Hospital, Beijing, China #P532
Poster Session
Friday, June 14, 2024
Phase 1 Study of HMPL-306 in Patients with Advanced Acute Myeloid Leukemia with Isocitrate Dehydrogenase (IDH) Mutations: Preliminary Results of the Dose Escalation Cohorts Pau Montesinos
Hospital Universitario La Fe, Valencia, Spain #P549
Poster Session
Friday, June 14, 2024
Phase II Study of EZH2 Inhibitor Tazemetostat plus Amdizalisib, a PI3K Inhibitor, in Patients with Relapsed/Refractory Lymphomas Mingci Cai
Ruijin Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China #P2080
e-Poster Presentation
Friday, June 14, 2024
Results from a Phase 1 Dose Escalation Study of HMPL-760, a Third Generation, Highly Selective, Reversible BTK Inhibitor in Chinese Patients with Relapsed/Refractory (R/R) Lymphomas Ying Qian
Ruijin Hospital affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China #P2054
e-Poster Presentation
Friday, June 14, 2024
A Phase 1b Study to Evaluate the Safety and Preliminary Efficacy of Sovleplenib, a Syk Inhibitor, in Adult Subjects with Immune Thrombocytopenia
Waleed Ghanima
University of Oslo, Oslo, Norway #PB3341
Publication Only