CCR7 overexpression plays a key role in the metastasis of human breast cancer. a) H&E staining (left panel) and immunofluorescence staining (right panel) for CCR7 expression in adjacent tumor sections from both invasive and noninvasive human TNBC specimens (red: CCR7, blue: nucleus). b) H&E staining (left panel) and immunofluorescence staining (right panel) for CCR7 expression in adjacent tumor sections from both IDC and ILC of human TNBC specimens at different magnification (red: CCR7, blue: nucleus). c) RSEM-normalized RNA-seq values of CCR7 in normal tissue, primary tumor, and metastatic tumor from 1236 breast cancer patient data from TCGA (NS: not significant, p ≥ 0.05;*, p < 0.05; **, p < 0.01).