On the basis of this study, it appears likely that invasive ductal carcinomas have a greater likelihood of lymph node involvement compared with other types; however, this relationship was not statistically significant, and our study is in line with the previous published studies.19 Following invasive ductal carcinomas, carcinoma in situ had the highest frequency of HER2/neu overexpression. Here, ERBB2 is linked to invasive ductal breast carcinoma.