LGALS1 and leukemia: In the light of reports suggesting that galectin-1 does not activate a full apoptotic pathway in some kinds of cells including T cells [29], T leukemia cells, promyelocytic cells and activated neutrophils [30], the possible explanation may be that K562 cells induced by galectin-1 undergo partial apoptotic process, which has less relevance with drug resistance than the full apoptotic process does.