Effects of 1,25(OH)₂D₃ on total TM and TF antigen in several leukemic cell lines and PB cells freshly isolated from patients with leukemia. Leukemic cells were incubated with 1,25(OH)₂D₃ (0.1 μmol/L) for 24 hours. Total TM (A) and TF (B) antigen levels are shown on ordinates. Data represent means of duplicate measurements.