RecruitingPhase 2Drug trialMitoxantrone Hydrochloride Liposome, Standard-dose of Cytarabine and Venetoclax in the Treatment of R/R AMLThe purpose of this prospective, multi-center, single-arm, phase 2 study is to evaluate the efficacy and safety of a combination regimen of mitoxantrone hydrochloride liposome injection, standard-dose of cytarabine and venetoclax (MAV) in the treatment of relapsed or refractory (R/R) AML. The study plan to enroll 72 R/R AML patients who are expected to receive laboratory tests of bone marrow and blood specimens at regular times after MAV treatment.