TP53 and invasive ductal breast carcinoma: Results: The expression rate of HPV 16/18 DNA and p53 protein in invasive ductal carcinoma is significantly higher than those in breast fibroadenoma and normal breast tissues (p<0.05); the expression in cases with axillary lymph node metastasis is dramatically higher than those without (p<0.05); the expression of p53 protein increases with TMN staging advance.