Perioperative outcomes following composite resections for colorectal cancer with liver metastases: Can we do better?
412 Background: Curative resection for synchronous colorectal cancer and liver metastases (CRC/LM) can be performed simultaneously as composite resections or in isolation as staged resections. Composite resections expedite care and may be more cost-effective, but there is persistent controversy regarding their safety. This study aimed to identify potentially modifiable differences in adverse perioperative outcomes after composite versus (vs) isolated resection for CRC/LM. Methods: All patients (pts) with CRC/LM in the American College of Surgeons-National Surgical Quality Improvement Program Participant Use File who underwent elective colon, rectal, and/or liver resections from 2005 to 2013 were identified. Patient/procedure characteristics and perioperative outcomes were compared in pts who had isolated colon or rectal resection (CR or RR), isolated liver resection (LR), or composite colon/liver or rectal/liver resection (CLR or RLR) using chi square or Wilcoxon tests. Multiple logistic regression models were used to determine the independent effect of resection type on outcomes. Results: 13,523 pts underwent CR (3,601; 26.6%), RR (2,018; 14.9%), LR (7,002; 51.8%), CLR (513; 3.8%), or RLR (389; 2.9%). In colon cancer pts, the 30-day (30-d) rate of death/serious complication (DSC) was significantly higher after CLR (33.7%) than after CR (22.0%; adjusted odds ratio [aOR] 0.41, 95% confidence interval [95% CI], 0.33 to 0.52) or LR (13.9%; aOR 0.33; 95% CI, 0.27 to 0.41). Similarly, in rectal cancer pts, the 30-d rate of DSC was significantly higher after RLR (24.7%) than after RR (21.5%; aOR 0.66; 95% CI, 0.50 to 0.88) or LR (13.9%; aOR 0.47; 95% CI, 0.36 to 0.62). Differences in adverse outcomes following composite resections were not due to mortality, but to higher rates of pulmonary/infectious complications and returns to the operating room. Conclusions: Composite resections for CRC/LM are associated with higher rates of DSC, particularly in colon cancer pts. Aggressive targeted strategies to prevent pulmonary and infectious complications could significantly improve outcomes in pts undergoing composite resections for synchronous CRC/LM.