| Sumario: | Bone metastasis (BM) is the advanced complication of breast cancer, while bone marrow-derived mesenchymal stem cells (BMSCs) in the microenvironment unclearly contribute to cancer metastasis. This study investigated potential roles of transforming growth factor- (TGF-) <italic>α</italic> in the interaction between breast cancer and BMSCs in BM. Clinical cases of breast cancer with bone metastasis (BMBC), breast cancer without bone metastasis (Non-BM-BC), and benign fibroadenoma (Benign) were enlisted in a retrospective study. TGF-<italic>α</italic> was found obviously overexpressed in BM lesion of BMBC compared to primary lesion of both BMBC and Non-BM-BC (P<0.01), and TGF-<italic>α</italic> was higher in primary lesion of both BMBC and Non-BM-BC (P<0.01) than Benign group. Interestingly, TGF-<italic>α</italic> in nontumor tissues of both BMBC and Non-BM-BC was at a higher level than Benign group (P<0.01), and numbers of macrophages in nontumor tissues of both BMBC and Non-BM-BC (P<0.01) were higher than Benign group. Furthermore, in cultured human BMSCs, TGF-<italic>α</italic> stimulated production of procancer cytokines including IL-6, VEGF, FGF10, FGF17, and TGF-<italic>β</italic>1 in a dose-dependent manner. Thus, TGF-<italic>α</italic> in BC could potentially be an important signal of carcinogenesis and metastasis. Macrophages in the nontumor tissue of BC may not be protective but could promote cancer metastasis.
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