Abstract
This study investigates the impact of neoadjuvant therapy (NT) on body composition and its correlation with long-term survival and other clinical outcomes in patients with advanced gastric cancer. We utilized Computed Tomography (CT) scans to measure body composition before and after NT, including Subcutaneous Adipose Tissue Index (SATI), Visceral Adipose Tissue Index (VATI), Skeletal Muscle Index (SMI), and Muscle Density (MA). We then analyzed the decrease in body composition in relation to tumor regression, inflammatory markers, nutritional scores, and long-term survival. Our findings reveal a negative correlation between the decrease in SATI and VATI after NT, and both tumor regression and nutritional score. Notably, patients who experienced a significant loss in SATI or VATI post-NT had shorter Recurrence-Free Survival (RFS) and Overall Survival (OS). Additionally, significant loss in SATI and VATI emerged as an independent risk factor for both RFS and OS. In conclusion, our study convincingly demonstrates that in patients with advanced gastric cancer, SATI and VATI decreases after NT and is negatively associated with tumor regression and nutritional score. A significant loss in SATI and VATI is a risk factor for shorter RFS and OS, thereby underscoring the importance of maintaining body composition during NT.
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