Abstract
Background
The effects of primary tumor location on colorectal liver metastasis (CRLM) and post-hepatic-metastasectomy overall survival (OS) are controversial. This study evaluated the difference in post-hepatic-metastasectomy OS among right-sided colon, left-sided colon, and rectal cancer groups.
Methods
In total, 381 patients who underwent curative-intent CRLM resection were enrolled. Patients were grouped based on the primary tumor location (right-sided, left-sided, and rectum). The Kaplan–Meier analysis and log-rank test were performed for survival analysis. The univariate and multivariate analyses of clinical and pathological factors were performed using the Cox proportional hazards model.
Results
Significant OS difference was noted among the three groups (log-rank, p = 0.014). The multivariate analysis revealed a 32% lower death risk in left-sided colon cancer compared with right-sided colon cancer (hazard ratio [HR] 0.68, p = 0.042), whereas no OS difference was noted between the rectal cancer and right-sided colon cancer groups. The left- versus right-sided OS advantage was noted only in the KRAS wild-type subgroup (HR 0.46, p = 0.002), and a rectal versus right-sided OS disadvantage was noted in the KRAS mutant subgroup (HR 1.78, p = 0.03).
Conclusions
The CRLM post-hepatic-metastasectomy OS was superior in left-sided colon cancer than in right-sided colon cancer and was similar in rectal and right-sided colon cancer. The OS difference in different primary tumor locations is dependent on KRAS mutation status, with a decreased left- versus right-sided death risk noted only in KRAS wild-type colon cancer and an increased rectal versus right-sided death risk noted only in KRAS mutant colon cancer.
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We give thanks for grants from the Taiwan Clinical Oncology Research Foundation and to the Taipei Veterans General Hospital Big Data Center.
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THC: Data analysis and manuscript writing. WSC, JKJ, SHY, HSW, SCC, YTL, CCL, HHL, SCH, HHC, GYC, CYH, HJL, SCC, and YC: Data collection or management. HWT: Project development, data analysis, and manuscript editing.
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Chen, TH., Chen, WS., Jiang, JK. et al. Effect of Primary Tumor Location on Postmetastasectomy Survival in Patients with Colorectal Cancer Liver Metastasis. J Gastrointest Surg 25, 650–661 (2021). https://doi.org/10.1007/s11605-020-04855-5
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DOI: https://doi.org/10.1007/s11605-020-04855-5