Data selection criteria
tumor
ONCOLOGY, TUMOR, DISEASE
A retrospective analysis was conducted using the SEER database, where 2889 patients with CVC between 2004-2015 were initially selected, based on the criteria mentioned previously. After a careful screening process, 1125 patients were finally selected, whereas 1764 patients were excluded due to unknown tumor size, race, or marital status, as well as unknown AJCC stage or an age exceeding 100 years old, which criteria were exclusion. The data selection procedure is depicted in Flow chat of research selection. SEER, Surveillance, Epidemiology, and End Result Program; ICD-0-3, International Classification of Disease for Oncology, Third Edition.