In this study, we showed that replicative senescent AD-MSCs significantly promoted the proliferation of LoVo colorectal-cancer cells in comparison to premature AD-MSCs, and the expression of galectin-3, a powerful modulator of cell migration and spread in carcinoma cells, correlated with the stimulatory effect of senescent AD-MSCs on colorectal cancer cells proliferation. The gene discussed is LGALS3; the disease is Alzheimer disease.