Pathological assessment
The pathology results were reviewed by two experienced pathologists from each department. According to the WHO classification of tumors of female reproductive organs, the NECC has been classified into four histological subtypes: small cell (SCNEC), large cell (LCNEC), and carcinoid (typical and atypical) [9]. Pathology results demonstrated that all patients had high-grade NECC (SCNEC and LCNEC).