CXCL13 was secreted by PD-1hiCD8+ T cells in lung cancer (30), by CD103+CD8+ cells in ovarian cancer (31), and by CXCR5–PD-1hiCD4+ follicular helper like T cells in breast cancer (32) and nasopharyngeal cancer (33). Here, CXCL13 is linked to ovarian carcinoma.