ST6GAL1 and acute lymphoblastic leukemia: After 12 days of vincristine chemotherapy, proliferation of BCP-ALL cells with original levels of ST6Gal1 expression (EV samples Figures 7B–D) plated on OP9 Galectin-1 knockout stroma was comparable (LAX57 and LAX56) or enhanced (US7) (Figures 7B, C, compare white bars) with respect to the same cell types grown on wild-type OP9 cells.