Lung cancer and breast cancer are different malignant tumors. They are very different from each other in terms of location, type of pathology and treatment. Lung cancer is a malignant tumor that occurs mainly in the lung, while breast cancer is a malignant tumor that occurs mainly in the breast. The main pathological types of lung cancer are divided into two categories, non-small cell lung cancer and small cell lung cancer, among which non-small cell lung cancer is divided into adenocarcinoma, squamous carcinoma and large cell carcinoma, while the main pathological types of breast cancer are invasive lobular carcinoma and invasive ductal carcinoma. In terms of treatment methods, surgery is the main treatment for early stage lung cancer patients, while radiotherapy, chemotherapy and targeted therapy are the main comprehensive treatments for patients with intermediate and advanced stages. For breast cancer patients, surgery is also the main treatment in early stage, while radiotherapy, chemotherapy, targeted therapy and endocrine therapy are also the main comprehensive treatment for middle and late stage. For breast cancer, compared to lung cancer, a relatively special treatment modality has been added, which is endocrine therapy.