ANXA5 and acute myeloid leukemia: Drug sensitivity, as assessed by flow cytometry and staining with a combination of Annexin V-FITC and propidium iodide (PI) to identify late apoptotic cells (double positive for Annexin V and PI) and early apoptotic cells (only Annexin V+), showed that Antimycin A enhanced cytarabine cytoxicity in three primary AML patient samples.