JOURNAL ARTICLE
META-ANALYSIS
SYSTEMATIC REVIEW
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Impact of Postoperative Complications on Survival and Recurrence After Resection of Colorectal Liver Metastases: Systematic Review and Meta-analysis.

Annals of Surgery 2019 December
OBJECTIVE: To study the effect of postoperative complications (POC) on overall survival (OS) and disease-free survival (DFS) after surgical resection of colorectal liver metastases (CRLM).

SUMMARY BACKGROUND DATA: Morbidity rates after liver resection can reach 45%. The negative impact of POC on oncologic outcomes has been reported in various types of cancer, especially colorectal. However, data on the consequences of POC after CRLM resection on long-term survival are scarce.

METHODS: Eligible studies examining the association between POC after CRLM resection and OS/DFS were sought using the PubMed and Web of Science databases. A random-effects model was used to calculate pooled effect estimate for OS and DFS hazard ratios (HR), estimating between-study variance with restricted maximum likelihood estimator with Hartung-Knapp adjustment. Subgroup analysis was used to control the effect of POC on OS and DFS for: 1) Method used to define postoperative complications, 2) Exclusion of early postoperative death from survival analysis, 3) Method of data extraction used, and 4) Tumor and treatment characteristics.

RESULTS: Forty-one studies were deemed eligible, including 12,817 patients. POC patients had a significant risk of reduced OS compared with no POC group (HR 1.43 [95% CI: 1.3, 1.57], P < 0.0001). POC had also a negative impact on DFS. The HR for reduced DFS was 1.38 [95% CI 1.27, 1.49], P < 0.0001. The negative impact of POC on survival and recurrence was confirmed in subgroup analysis.

CONCLUSIONS: Our findings evidence the negative impact of POC on survival and recurrence after CRLM resection.

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