OBJECTIVE: In this study, we performed a systematic review and meta-analysis to evaluate the impact of preoperative underweight status on postoperative complications and survival outcome of gastric cancer (GC) patients. METHODS: ). The relevant data were extracted and pooled effect size were assessed using a fixed effect model or random effect model. RESULTS: = 64.0%) of underweight patients was significantly poorer than that of normal weight patients. CONCLUSION: Preoperative underweight status was significantly associated with unfavorable postoperative outcome of GC patients. The status may represent excessive nutritional consumption and malnutrition resulting from aggressive tumor.
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