HUTCHMED Initiates Phase I Trial of Menin Inhibitor HMPL-506 in Patients with Hematological Malignancies in China

Hong Kong, Shanghai & Florham Park, NJ —   Friday, June 7, 2024: HUTCHMED (China) Limited (“HUTCHMED”) (Nasdaq/AIM:HCM; HKEX:13) today announces that it has initiated Phase I clinical trial of its menin inhibitor HMPL-506 in patients with hematological malignancies in China. The first patient received their first dose on May 31, 2024.

This is a Phase I, multicenter, open-label clinical study to evaluate the safety, pharmacokinetics and efficacy of HMPL-506 in patients with hematological malignancies. The study is divided into two phases, a dose escalation phase and a dose expansion phase. The study is expected to enroll at least 60 patients. The lead principal investigators are Dr. Jianxiang Wang and Dr. Hui Wei of Chinese Academy of Medical Sciences Blood Diseases Hospital. Additional details may be found at clinicaltrials.gov, using identifier NCT06387082.

About HMPL-506 and Menin

HMPL-506 is a novel, investigational, selective small molecule inhibitor for oral administration targeting the menin protein. The menin protein is a scaffold protein that controls gene expression and cell signaling. Mixed-lineage leukemia (“MLL”, also known as KMT2A) rearrangement and nucleophosmin 1 (“NPM1”) mutation play key roles in acute myeloid leukemia (“AML”). MLL-rearranged AML accounts for approximately 5% of adult AML and NPM1-mutant AML accounts for approximately 30% of AML.^{[i],[ii],[iii]} Current research has demonstrated that the inhibition of menin-MLL interaction is a feasible therapeutic strategy in MLL-rearranged and/or NPM1-mutant AML.^{[iv],[v],[vi],[vii]} Currently there is no menin inhibitor approved worldwide. HUTCHMED currently retains all rights to HMPL-506 worldwide.

According to the National Cancer Institute (NCІ), there will be approximately 20,380 new cases of AML in the U.S. in 2023 and the five-year relative survival rate is 31.7%.^[viii] There were an estimated 19,700 new cases of AML in China in 2018 and is estimated to reach 24,200 in China in 2030.^[ix]

About HUTCHMED

HUTCHMED (Nasdaq/AIM:HCM; HKEX:13) is an innovative, commercial-stage, biopharmaceutical company. It is committed to the discovery and global development and commercialization of targeted therapies and immunotherapies for the treatment of cancer and immunological diseases. It has approximately 5,000 personnel across all its companies, at the center of which is a team of about 1,800 in oncology/immunology. Since inception it has focused on bringing cancer drug candidates from in-house discovery to patients around the world, with its first three oncology drugs marketed in China, the first of which is also marketed in the U.S. For more information, please visit: www.hutch-med.com or follow us on LinkedIn.

REFERENCES

^[i] Ibrahim S, Estey EH, Pierce S, et al. 11q23 abnormalities in patients with acute myelogenous leukemia and myelodysplastic syndrome as detected by molecular and cytogenetic analyses. Am J Clin Pathol, 2000, 114(5):793-7.

^[ii] Grimwade D, Hills RK, Moorman AV, et al. Refinement of cytogenetic classification in acute myeloid leukemia: determination of prognostic significance of rare recurring chromosomal abnormalities among 5876 younger adult patients treated in the United Kingdom Medical Research Council trials. Blood, 2010,116(3):354-65.

[iii] Falini B, Mecucci C, Tiacci E, et al. Cytoplasmic nucleophosmin in acute myelogenous leukemia with a normal karyotype. N Engl J Med. 2005;352(3):254-66.

^[iv] Krivtsov AV, Evans K, Gadrey JY, et al. A Menin-MLL Inhibitor Induces Specific Chromatin Changes and Eradicates Disease in Models of MLL-Rearranged Leukemia. Cancer Cell 2019;36:660–73 e11.

^[v] Uckelmann HJ, Kim SM, Wong EM, et al. Therapeutic targeting of preleukemia cells in a mouse model of NPM1 mutant acute myeloid leukemia. Science 2020;367:586–90.

^[vi] Borkin D, He S, Miao H, et al. Pharmacologic inhibition of the Menin-MLL interaction blocks progression of MLL leukemia in vivo. Cancer Cell 2015;27:589–602.

[vii] ^Klossowski S, Miao H, Kempinska K, et al. Menin inhibitor MI-3454 induces remission in MLL1-rearranged and NPM1-mutated models of leukemia. J Clin Invest 2020;130:981–97.

^[viii] National Cancer Institute – seer.cancer.gov/statfacts/html/amyl.html.

^[ix] Lin J, Yao D, Qian J, et al. ІDH1 and ІDH2 mutation analysis in Chinese patients with acute myeloid leukemia and myelodysplastic syndrome. Ann Hematol. 2012;91(4):519-525. doi:10.1007/s00277-011-1352-7.