Infectious complications (ICs) have been reported as major causes of postoperative mortality in patients with cancer. However, to the best of our knowledge, the impact of ICs after gastrectomy on non‑gastric cancer‑related deaths (NGCDs) remains unexplored. The present study aimed to identify the impact of ICs after gastrectomy on NGCDs. A retrospective analysis of 712 patients with gastric cancer who underwent curative gastrectomy was conducted. The participants were categorized into IC and non‑IC groups based on the incidence of postoperative IC. Clinicopathological factors and non‑gastric cancer‑related survival (NGCS) rates were compared between groups. Further NGCD and associated risk factor analyses were performed in a background factor‑adjusted cohort using multivariate analysis. Among the 712 patients, 112 developed ICs (Clavien‑Dindo classification grade ≥II). In the entire cohort, the IC group had a significantly worse 5‑year cumulative incidence of NGCD (17.8 vs. 10.6%; Gray's P=0.021) compared with the non‑IC group. Although a number of clinicopathological factors differed between the groups, including patient background, operative factors and tumor factors, the risk factors for NGCD identified in the multivariate analysis were older age, low prognostic nutritional index, low skeletal muscle index and Charlson comorbidity index ≥1, excluding IC incidents. The IC group exhibited more background factors contributing to NGCDs, suggesting a potential increase in NGCD regardless of IC incidence.

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