CXCL13 and non-small cell lung carcinoma: In NSCLC, intratumoral CD8+ T lymphocyte populations with a high level of PD-1 (PD-1T) express higher levels of CXCL13 and secrete more CXCL13 than CD8+ T cells with intermediate (PD-1N) and no PD-1 expression (PD-1−).