Comprehensive mRNA analysis of human CD4+ T cells infiltrating into breast cancers has demonstrated that the expression of Tfh cell signature genes including CXCL13 correlates with better outcomes 3, implying the involvement of CXCL13‐producing Tfh cells in local immune responses of ELSs 1, 11, 12. Here, CXCL13 is linked to breast carcinoma.