Abstract
Purpose
The current study aimed to compare the oncologic outcome and pattern of metastasis after abdominoperineal resection (APR) and low anterior resection (LAR) treating lower rectal cancer.
Methods
A total of 804 patients undergoing curative resection (R0) were enrolled prospectively. The APR and LAR groups (n = 402, respectively) were matched for gender, age, and stage, for a retrospectively comparative analysis.
Results
In a multivariate analysis with potential variables, APR itself was not a risk factor for increased local recurrence (LR) or reduced survival (P = 0.243–0.994). Circumferential resection margin (CRM) involvement as an operation-related risk was 1.6-fold more frequent in the APR group and was significantly associated with LR and systemic recurrence (OR, 2.487–4.017; P < 0.01). Circumferential margin positivity (CRM+) was concurrently correlated with advanced stage, larger tumor (long diameter, >4 cm), and longer sagittal midpelvic diameter (>10 cm) in a multivariate analysis (P < 0.001–0.05). The site of metastasis did not differ between the two groups, with the exception of lung metastasis which was more frequent in the APR group (APR vs. LAR: 15.9 vs. 10 %, P = 0.015). In the APR group, CRM+ and the presence of an infiltrating tumor were correlated with disease-free survival (hazard ratio (HR), 1.644 and 1.654, respectively), whereas elevated serum carcinoembryonic antigen and LVI+ were correlated with overall survival (HR, 1.57 and 1.671, respectively), in a multivariate analysis with potential variables (P < 0.05).
Conclusions
When performed with appropriate skill to achieve R0 resection, APR can be used safely without impairing oncological outcome, although sphincter-preserving surgery should remain the preferred option.
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Acknowledgments
This study was supported by grants to J. C. Kim from the Asan Institute for Life Sciences (2011-069), the Korea Health 21 R&D Project (A062254), and the Center for Development and Commercialization of Anti-Cancer Therapeutics (A102059), Ministry of Health and Welfare, Republic of Korea.
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Supplementary Table 1
Multivariate analysis using potentially survival-related factors in the respective group (DOC 51 kb)
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Kim, J.C., Yu, C.S., Lim, S.B. et al. Abdominoperineal resection and low anterior resection: comparison of long-term oncologic outcome in matched patients with lower rectal cancer. Int J Colorectal Dis 28, 493–501 (2013). https://doi.org/10.1007/s00384-012-1590-8
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DOI: https://doi.org/10.1007/s00384-012-1590-8