Effects of LUM on apoptosis of Nalm-6 cells. Flow cytometry analysis results demonstrated that the proportion of total apoptotic cells decreased in the Nalm-6 cells of the BM-MSCs-LUM-329 and 437 groups compared with Nalm-6+BM-MSCs group. Compared with Nalm-6+BM-MSCs group, total apoptotic cells remained unchanged in BM-MSCs-cDNA3.1-LUM group. *P<0.05, **P<0.01. Error bars represent standard error of the mean (n=6). BM-MSCs, bone marrow mesenchymal stem cells; LUM, lumican; PI, propidium iodide.