Data resources
cancer, tumor
MPBC, TUMOR, CANCER
Data on patients diagnosed with MpBC from 2010 to 2019 are from the Surveillance, Epidemiology and End Results (SEER) program. The SEER database is a population-based cancer database in the United States, including 18 cancer registries, covering about 30% of the US population. Since the patient’s personal information in the SEER database cannot be identified, this study does not require ethical approval and informed consent. All the research methods in this study comply with the provisions of the SEER database.This study collected data from older women with MpBC. Inclusion criteria: 1) the diagnosis year is 2010–2019; 2) age ≥ 65 years old; 3) women; 4) the pathological diagnosis was MpBC. Exclusion criteria: 1) TNM stage unknown; 2) tumor size is unknown; 3) surgical procedure is unknown; 4) estrogen receptor(ER), progesterone receptor(PR) and human epidermal growth factor receptor-2(HER2) status unknown; 5) survival time less than one month. The patient screening process is shown in Fig. The flow chart of patient selection