CXCL1 and breast cancer: Besides, Kaplan–Meier curves indicated that N1 chemoattractant genes (Cxcl1, Cxcl2, and Cxcl5) are favorable prognosis markers (HR < 1, HR: hazard ratio, p values ranging from 4e−3 to 1e−5) while N2 chemoattractant genes (S100a8 and S100a9) are unfavorable prognosis markers (HR > 1, p values ranging from 4e−10 to 1e−12) for breast cancer (Fig. S14).