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Little is known about the association between sarcopenia development after gastrectomy and gastric cancer prognosis after recurrence. The present study retrospectively examined the effects of decreased psoas muscle index (PMI) on post-recurrence prognosis after gastrectomy. A total of 67 patients with gastric cancer recurrence were included in the present study. PMI at pre-operation and recurrence were calculated, and 25 patients whose PMI reduction rate value was lower than the cutoff values (male=0.766 and female=0.704) were classified into the sarcopenia group and 42 patients into the non-sarcopenia group. There were no significant differences between the groups regarding age, sex, pathological stage, and nutrition and inflammation indices at the time of recurrence. Post-recurrence overall survival (OS) was significantly shorter in the sarcopenia group compared with the non-sarcopenia group (P<0.001). The post-recurrence survival rate was significantly worse in the sarcopenia group compared with the non-sarcopenia group (P<0.001). In multivariate analysis, sarcopenia (HR=5.04) and the total courses of chemotherapy after recurrence (HR=3.88) were independent unfavorable prognostic factors. In conclusion, sarcopenia and fewer total courses of post-recurrence chemotherapy were poor prognostic factors after gastric cancer recurrence. To improve prognosis, preventing sarcopenia development after gastrectomy is required.

Impact of postoperative reduced skeletal muscle on prognosis after recurrence in gastric cancer