Surgeon Age in Relation to Patients' Long-Term Survival after Gastrectomy for Gastric Adenocarcinoma: Nationwide Population-Based Cohort Study.

Background Increasing surgeon age may influence patient outcomes after complex procedures due to gained experience but also decreased technical and cognitive abilities. This study aimed to clarify whether surgeon age influences patients' long-term survival after gastrectomy for gastric adenocarcinoma.Methods Population-based cohort study including all patients who underwent open and curatively intended gastrectomy for gastric adenocarcinoma between 2006 and 2015 in Sweden, with follow-up throughout 2020. Surgeon age, categorized into three equal-sized groups (tertiles), was assessed in relation to 5-year all-cause mortality rate (main outcome) and 5-year disease-specific death (secondary outcome) using multivariable Cox regression adjusted for patient age, sex, education, co-morbidity, pathological tumour stage, tumour sublocation and neoadjuvant therapy. Lymph node yield, resection margin status, in-hospital complications and annual surgeon volume of gastrectomy were considered potential mediators.Results Among 1647 patients, the 5-year all-cause mortality rate was increased for surgeon age >= 55 years (adjusted HR 1.21, 95% c.i. 1.04 to 1.41) and borderline elevated for age 47-54 years (HR 1.16, 95% c.i. 0.99 to 1.36), compared with age <= 46 years. Five-year disease-specific death was increased for surgeon age >= 55 years (HR 1.25, 95% c.i. 1.06 to 1.48) and 47-54 years (HR 1.22, 95% c.i. 1.02 to 1.44), compared with age <= 46 years. The associations attenuated and became statistically non-significant after adjustment for lymph node yield, resection margin status and complications.Conclusion Surgeon age >= 47 years might be associated with worse long-term survival in patients who undergo gastrectomy for gastric adenocarcinoma, possibly mediated in part by differences in lymph node yield, resection margin status and complications. In this large and population-based cohort study, we found an increased 5-year mortality rate for older surgeons compared with younger surgeons. This was at least partly mediated by differences in lymph node yield, resection margin status and complications. This is the first study to examine whether surgeon age influences long-term survival of gastric cancer.