Tumor location, maximum diameter, molecular classification, ER status, PR status, HER2 status, TNM stage, and CA15‐3 were analyzed for this calculation and TNM stage was classified according to the eighth edition of American Joint Committee on Cancer TNM staging system.21 We obtained significant correlations between IL‐13 rs847 and TNM stage (P = 0.041). This evidence concerns the gene ERBB2 and neoplasm.