IL6 and breast cancer: Additionally, paracrine factors secreted by BM‐MSCs or ADMSCs‐exos, particularly IL‐6, significantly enhance ER‐positive breast cancer cell proliferation, such as MCF7, T47D, or ZR‐75‐1, both in vitro and in vivo, contributing to an overall progrowth phenotype for stromal MSCs across various contexts.184, 185