BCL2 and lung cancer: Our findings regarding the treatment effect of hUMSCs-CM upon MCF-7 cells are in line with those of Yuan Yin et al., which addressed that hUMSCs-CM induced apoptosis of lung cancer cells by downregulating pro-caspase-7 and Bcl-2, indicating the activation of intrinsic and extrinsic apoptosis pathways [10].