Phase I, multicenter study to evaluate the safety, pharmacokinetics, pharmacodynamics and efficacy of HMPL-306 in Patients of Relapsed/Refractory Myeloid Leukemia/Neoplasms with IDH1 and/or IDH2 Mutation.

The purpose of this Phase I, multicenter study is to evaluate the safety, pharmacokinetics, pharmacodynamics and efficacy of HMPL-306 in Patients of Relapsed/Refractory Myeloid Leukemia/Neoplasms with IDH1 and/or IDH2 Mutation. The first stage of the study is a dose escalation phase where cohorts of patients will receive ascending oral doses of HMPL-306 to determine maximum tolerated dose (MTD) and/or the recommended Phase II dose. The second stage of the study is a dose expansion phase where three cohorts of patients will receive HMPL-306 to further evaluate the safety, tolerability, and clinical activity of the recommended Phase II dose.

Inclusion Criteria:

• ≥18 years of age;
• Signed Informed Consent Form;
• Relapsed/refractory Acute myeloid leukemia (AML), myelodysplastic syndrome (MDS) or chronic myelomonocytic leukemia(CMML) and others myeloid neoplasm;
• IDH1 and/or IDH2 mutated disease status as assessed by local laboratory;
• Cooperative Oncology Group (ECOG) performance status of 0-2;
• Subjects must be amenable to serial bone marrow biopsies, peripheral blood sampling, and urine sampling during the study.

Exclusion Criteria:

• Previously treated with any prior IDH1 inhibitor, IDH2 inhibitor, or IDH1/IDH2 double-targeted therapy and had disease progression during treatment;
• with known involvement or clinical symptoms of central nervous system (CNS);
• Patients who have undergone HSCT within 60 days;
• Without adequate liver or kidney function;
• With known infection with active hepatitis B or C;
• With known infection with human immunodeficiency virus (HIV);
• History of clinically significant or active cardiac disease;
• Active clinically significant infection;
• Taking known strong cytochrome P450 (CYP) 2C8 inducers or inhibitors;
• Pregnancy or breast-feeding.