Lobular carcinoma of the breast and ductal carcinoma are relatively more malignant. Lobular carcinoma of the breast is a type of breast cancer that develops from the fine development of the epithelium of the breast follicular lobules and accounts for a relatively small proportion of invasive breast cancer. It can develop from breast cancer lobular atypical hyperplasia, to severe atypical hyperplasia, to lobular carcinoma in situ, and further to invasive lobular carcinoma. The results are usually better after treatment. Ductal carcinoma is the main type of breast cancer nowadays, which belongs to malignant tumor, his spread rate is higher than all adenocarcinomas, and the cure rate is lower. Ductal carcinoma occurs in the ductal portion of the breast and may pass through the ducts into the structural tissues of the breast, thus entering the bloodstream, through which it spreads throughout the body. The disease worsens significantly once metastasis occurs, at which point survival is shorter. Both lobular carcinoma and ductal carcinoma are dangerous and should be examined and treated as early as possible to avoid aggravating the progression of the disease.