Abstract
Background
We sought to determine the prognostic role of tumor size on cause-specific survival (CSS) of patients with stage IIA colon cancer.
Methods
Surveillance, Epidemiology and End Results (SEER) database was utilized to identify patients with stage IIA colorectal cancer (examined lymph nodes ≥12) diagnosed from 1988 to 2003. The prognostic effect of tumor size on CSS was evaluated by univariate and multivariate analyses.
Results
A total of 8775 patients were enrolled in the analysis. The median follow-up time was 109 months. As determined by minimal P value method, tumor sizes of 2.5 and 6.0 cm were used as optimal cutoff value to divide the cohort. The 8-year CSS of colon cancer with tumor sizes ≤2.5, 2.6–6.0, and >6.0 cm was 81.6, 86.2, and 86.7 % respectively (P = 0.003). In the multivariate analysis of colon cancer, using ≤2.5-cm tumors as reference, decreased hazard ratio (HR) of CSS was observed in 2.6–6.0 cm (HR, 0.736; 95 % confidence interval (CI), 0.599–0.905; P = 0.004) and >6.0 cm (HR, 0.770; 95 % CI, 0.619–0.958; P = 0.019) tumors.
Conclusions
In stage IIA colon cancer, small tumor size represented a subset with decreased CSS. Further studies are merited to validate the unfavorable prognostic role of small tumor size in stage IIA colon cancer.
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Acknowledgments
This study was supported by the grant of the National Natural Science Foundation of China (No.81001055), Shanghai Pujiang Program (No.13PJD008). The authors would like to thank SEER program for public access of the database.
Authors’ contributions
Xu Ye, Cai Guoxiang, and Cai Sanjun are responsible for the study conception and design. Wang Yuwei, Changhua Zhuo and Gu Weilie acquired the data. Wang Yuwei, Shi Debing, and Zheng Hongtu analyzed and interpreted the data. Wang Yuwei and Shi Debing wrote the manuscript.
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A population-based study was conducted utilizing the SEER database to evaluate the prognostic significance of tumor size among stage IIA colon cancer. Surprisingly, very small tumor size may predict for worse cause-specific overall survival.
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Wang, Y., Zhuo, C., Shi, D. et al. Unfavorable effect of small tumor size on cause-specific survival in stage IIA colon cancer, a SEER-based study. Int J Colorectal Dis 30, 131–137 (2015). https://doi.org/10.1007/s00384-014-2056-y
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DOI: https://doi.org/10.1007/s00384-014-2056-y