RecruitingPhase 1Drug trialTreatment With ABT-199 (Venetoclax) and Purine Analogues in Relapsed/Refractory Acute Myeloid LeukemiaNon-commercial, open-label interventional phase Ib study to assess the effectivity of the combination of venetoclax and 6-mercaptopurine in patients with relapsed or refractory AML.