Introduction
Gastric cancer, heterogeneous malignancy, tumor, AJCC, Cancer
GASTRIC CANCER, TUMOR, CANCER
Gastric cancer (GC) is a highly heterogeneous malignancy with several pathologies exhibiting markedly varied molecular patterns, tumor behavior, and prognoses [American Joint Committee on Cancer (AJCC) TNM staging system has played an essential role in predicting the prognosis of GNEC [Based on the Surveillance, Epidemiology, and End Results (SEER) database, the study was directed to establish and validate a nomogram with a new risk stratification system for predicting the cancer-specific survival (CSS) of postoperative GNEC patients. The model’s performance was also compared with the AJCC 8th staging system.