Objective: To explore the effects and mechanism of the breast cancer stromal fibroblasts on the growth,apoptosis,invasion and metastasis of breast cancer cells by the co- culture in vitro and the inoculation of nude mice in vivo. Methods: In vitro: CAFs and NFs were separated from the same patient with infiltrating ductal carcinoma and co- cultured with breast cancer cell line MDA- MB- 231 in vitro. The growth,adherence,invasion and apoptosis of breast cancer cells were detected by using the method of MTT,M...