Breast conserving surgery (BCS) has been favored more recently due to its highest success rate in women with early-stage breast cancer, but it is not recommended for women at high risk of local recurrence. In the absence of distant metastases, breast cancer is a potentially curable disease. Our work identified a unique tumorigenic microenvironment of the interface zone and allowed for deeper insights into the tumor microenvironment of breast cancer that will serve as a helpful resource for advancing breast cancer diagnosis and therapy.īreast cancer has become the most commonly diagnosed cancer in women. Compared with the normal zone, the highly expressed BMPR1B gene promotes the tumorigenic ability of cancer cells in the interface zone. Cell–cell communication analysis revealed that there are special ligand–receptor pairs between different cell types in the interface zone, which protects endothelial cell apoptosis and promotes epithelial cell proliferation and migration, compared to the normal zone. Regulatory T cells, M2 macrophages, angiogenesis-related mast cells, stem cells with weak DNA repair ability, endothelial cells with angiogenic activity, fibroblasts with collagen synthesis and epithelial cells with proliferative activity form a unique tumorigenic microenvironment in the interface zone. ResultsĪfter screening, 88,548 high-quality cells were obtained and identified.

Cell proliferation, wound healing and clone formation experiments explored the function of differentially expressed gene BMPR1B, which were confirmed by tumor models in vivo. Pseudotime, cell–cell communication and pathway analysis were performed to characterize the zone-specific microenvironment. Through scRNA-seq data analysis, we compared the cell types and their transcriptional characteristics in the different zones. Methodsįor in vitro studies, single-cell RNA sequencing (scRNA-seq) was used to characterize the cells from the tumor zone, the normal zone and the interface zone with 5-mm-wide belts between the tumor invasion front and the normal zone. However, the heterogeneity and characteristics of the microenvironment in the interface area have not yet been thoroughly explored. The interface zone, area around invasive carcinoma, can be thought of as the actual tissue of the tumor microenvironment with precedent alterations for tumor invasion.

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