Univariate analysis showed that only low expression level of NFKB2 in the cohort of 48 ERα-negative breast tumors and high expression level of IL8 in the cohort of 48 ERα-positive breast tumors correlated with significantly shorter metastases-free survival, but at the limit of the significance (p = 0.039 and p = 0.022, respectively) (Table 11). This evidence concerns the gene CXCL8 and breast neoplasm.