To evaluate the effect of IFNβ-hUCMSCs on cancer cell proliferation, MDA-MB-231 and Hs578T human triple negative breast cancer cells were individually cultured in the bottom of Transwell culture dishes and either hUCMSCs or IFNβ-hUCMSCs were co-cultured in the inserts. Here, IFNB1 is linked to cancer.