Study of the Relationship Between the Pharmacokinetics (PK) and Pharmacodynamics of Venetoclax in Patients With Acute Myeloblastic Leukemia

Inclusion Criteria: * Male or female patient aged of at least 18 years on day of signing informed consent * Patient with histologically-confirmed diagnosis of Acute Myeloblactic Leukaemia according to classification ELN 2022 (European Leukemia Net 2022) * Patient who has to initiate treatment venetoclax-azacitidine as first line. Note : triple associations with targeted therapy are not authorized * Patient should understand, sign, and date the written voluntary informed consent form prior to any protocol-specific procedures performed. * Patient must be affiliated or benificiary of a social security system. Exclusion Criteria: * Patient with acute promyelocytic leukemia (APL, AML3) * Patient with AML eligible to intensive chemotherapy * Patient previously treaed with venetoclax and/or azacitidine * Patient participating to another clinical trial with a medicinal product * Any condition that contraindicates blood sampling procedures required by the protocol * Any psychological, family, geographical, or social situation that, according to investigator's judgment, could potentially prevent the signing of an informed consent form and/or woulld likely interfere compliance with study procedures. * Patient under curatorship, guardianship or judicial protection * Pregnant or breast-feeding female patient.