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The number of cancer survivors has increased rapidly, and there is a higher risk of developing a second cancer. Whether a prior malignancy could affect survival outcomes is unknown. We aimed to investigate the clinical characteristics and prognostic outcomes of prior malignancies in patients with gastric cancer. Patient data were extracted from the Surveillance, Epidemiology, and End Results (SEER) database. We used the Kaplan-Meier method, competing risk models, and Cox regression models to evaluate the impact of prior malignancy on su