MMP9 and breast cancer: (A-C) Boxplot representation of IL-6 (A) (Student’s t test, P < 2.2 × 10− 16), CCL2 (B) (Student’s t test, P < 2.2 × 10− 16), and MMP9 (C) (Student’s t test, P < 2.2 × 10− 16) expression levels in ER+/PR+ breast cancer compared to triple-negative breast cancer (TNBC).