Correlation between cTfh%, IL-21 and CXCL13 in patients with gastric cancer. The association between (A) cTfh% and IL-21, (B) cTfh% and CXCL13, and (C) IL-21 and CXCL13 are shown. cTfh, circulating follicular helper T cells; IL-21, interleukin 21; CXCL13, C-X-C motif chemokine ligand 13.