CXCL13 and cancer: As related to the clinical efficacy of immunotherapy, the expression of CXCL13 was also identified in a unique subset of PD‐1 highly cytotoxic T cells in NSCLC, which showed an association with ICI response18 Moreover, the correlation between CXCL13 expression and ICI response is also reproduced in other types of cancer.19, 20, 21, 22