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Objectives: Nomograms and scoring systems in gastric cancers have been mainly developed based on adequate lymph node (lN) dissections. This study aimed to perform external validation of a nomogram developed for predicting overall survival (OS) in gastric cancer patients with insufficient number of examined LNs (eLNs) and to evaluate its usability as compared with the 8 th American Joint Committee on Cancer (AJCC)'s Tumor-Node-Metastasis staging system., Methods: Medical records of 262 patients undergoing complete surgical resection for gastric cancers and having pathologically confirmed diagnosis were retrospectively reviewed. The study included 104 (39.7%) patients (82 males, median age, 60.3 years) with insufficient number of eLNs (<16). The 5-year OS rate was calculated using the nomogram and according to the AJCC system., Results: The median follow-up period was 37.4 months (range: 0.9-122.9). Of the patients, 69 (66.3%) died and 35 (33.7%) achieved 5-year survival within the follow-up period. The nomogram and the AJCC system predicted OS were significantly lower in patients who died than in those who achieved 5-year survival (p<0.001 for both). According to the receiver operative characteristics-curve, the area under the curve for the nomogram (0.801; 95% CI, 0.715-0.887; p<0.001) was larger than that for the AJCC system (0.754; 95% CI, 0.659-0.849; p<0.001)., Conclusion: The nomogram developed for gastric cancer patients with insufficient number of eLNs (<16) was effective in predicting 5-year OS in our cohort and was superior to the AJCC system., Competing Interests: Conflict of Interest: None declared. Authorship Contributions: Concept – M.K., M.O.Y.; Design – M.K., M.O.Y., B.B., R.H.G.; Supervision – R.H.G.; Materials – M.K., M.O.Y., R.H.G; Data collection &/or processing – M.K., M.O.Y.; Analysis and/or interpretation – M.K., B.B.; Literature search – M.K., M.O.Y.; Writing – M.K., M.O.Y., B.B., R.H.G.; Critical review – M.K., M.O.Y., B.B., R.H.G., (©Copyright 2022 by The Medical Bulletin of Sisli Etfal Hospital - Available online at www.sislietfaltip.org.)