CXCL1 and breast cancer: In the BC group of patients with luminal subtype B, the median concentrations of CXCL8 (5.95 pg/mL), CXCL1 (33.55 pg/mL), and CA 15-3 (19.2 IU/mL) were higher than in the group of patients with luminal subtype A (4.57 pg/mL; 27.83 pg/mL; 18.55 IU/mL, respectively); however, the used test did not show these correlations as statistically significant.