The purpose of the study is to study the epidemic features and diagnosis of female breast cancer, especially the diagnosis and treatment of breast cancer.The disease-free survival (DFS) and the total survival time(OS) of the breast cancer patients will also be studied.

The study is a multicentric, retrospective clinical study based on the hospital. The target number of cases are X patients who are eligible for breast cancer after radical mastectomy. To collect the clinicopathological data and treatment data of the breast cancer patients and do the follow-up visit of all the patients who are included in the study.

Inclusion Criteria:

• Female patients;
• The hospitalized patients who are confirmed of the primary breast cancer histologically;
• The date of the inpatients are within the month we chosen;
• Patients who are within the month we chosen have been received or under receiving the relevant treatment including surgical treatment, chemotherapy and radiotherapy.

Exclusion Criteria:

• Male breast cancer patients;
• Patients with breast cancer who are not under the chosen time;
• Non hospitalized patients.

The female breast cancer patients in Shaanxi Province of China, those study population shoud be the hospitalized patients who are confirmed of the primary breast cancer histologically, moreover, the date of the inpatients are within the month we chosen and those inpatients should have been received or under receiving the relevant treatment including surgical treatment, chemotherapy and radiotherapy.