Patient selection
tumor, death
DISEASES, TUMOR, PRIMARY TUMORS, DISEASE, ONCOLOGY
Data on UCCC patients registered between 2000 and 2018 were extracted from the SEER database using SEER* Stat (version 8.4.0.1) software. Inclusion criteria included: (1) pathologically confirmed UCCC, coded as 8310/3 according to the International Classification of Diseases for Oncology, Third Edition (ICD-O-3); (2) primary site included corpus uteri/uterus not specified; (3) age ≥ 18 years old. Exclusion criteria included: (1) multiple primary tumors; (2) incomplete clinicopathological data; (3) lost to follow-up or follow-up less than 1 month.Extracted data included: gender, age, race, marital status, tumor location, tumor size, year of diagnosis, pathological grade, SEER stage, AJCC TNM staging (7th edition), surgery, chemoradiotherapy, follow-up time and survival. The SEER stage (local, regional, and distant) was used to classify the extent of the disease as a surrogate for the traditional FIGO staging. The primary endpoint of the study was cancer-specific survival (CSS), defined as the time from diagnosis to death from UCCC or time to last follow-up. The optimal cutoff values for continuous variables were determined using the "X-Tile" software (Yale School of Medicine, CT, USA), converting age, tumor size, number of lymph nodes dissected into categorical variables.