Clinical Study of Venetoclax Combined With CACAG Regimen in the Treatment of Relapsed/Refractory Acute Myeloid Leukemia

Inclusion Criteria: * Patients who are able to understand and willing to sign the informed consent form (ICF). * All patients should aged 14 to 75 years,no gender limitation. * Patients with R/R AML, diagnosed in accordance with the 2021 edition of the CMA criteria * Liver function: ALT and AST≤2.5 times the upper limit of normal ,bilirubin≤2 times the upper limit of normal; * Renal function: creatinine ≤the upper limit of normal; * Patients without any uncontrolled infections , without organ dysfunction or without severe mental illness; * The score of Eastern Cooperative Oncology Group (ECOG) is 0-3,and the predicted survival ≥ 4 months. * Patients without severe allergic constitution. Exclusion Criteria: * Patients with allergy or contraindication to the study drug; * Female patients who are pregnant or breast-feeding. * Patients with a known history of alcohol or drug addiction on the basis that there could be a higher risk of non-compliance to study treatment; * Patients with mental illness or other states unable to comply with the protocol; * Less than 6 weeks after surgical operation of important organs. * Liver function: ALT and AST\>2.5 times the upper limit of normal ,bilirubin\>2 times the upper limit of normal;Renal function: creatinine \>the upper limit of normal; * The patient is not suitable for this clinical trial (poor compliance, substance abuse, etc.)