MUC5AC and invasive ductal breast carcinoma: The most common tumor histopathological type was invasive ductal carcinoma (IDC), accounting for 83.96% (445) compared to 4.91% (26) of other tumor types including invasive lobular carcinoma (ILC), mucin-producing carcinomas (Muc), and medullary carcinoma (Medul) and 11.13% (59) of unknown types.