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Yang Y, Yang X, Bai Z, Gu X, Shah SR, Salewala KS, Kevadiya MP, Zhang Z. Unraveling the role of tumor sidedness in prognosis of stage II colon cancer. Gastroenterol Rep (Oxf) 2024; 12:goae028. [PMID: 38617706 PMCID: PMC11014780 DOI: 10.1093/gastro/goae028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/14/2024] [Accepted: 01/23/2024] [Indexed: 04/16/2024] Open
Abstract
Background Stage II colon cancer has varying risks for metastasis, and treatment strategies depend on molecular and clinicopathological features. While tumor-sidedness is a well-accepted prognostic factor for stage III/IV colon cancer, its role in stage II is controversial. Understanding its effect in stage II is crucial for improving treatment strategies. Methods We analyzed clinical and follow-up data of colon cancer from the Surveillance, Epidemiology, and End Results database (2004-2017). Patients were divided into a primary study cohort (2010-2017) and a validation cohort (2004-2009). The baseline characteristics between right-sided colon cancer (RCC) and left-sided colon cancer (LCC) groups were compared. Moreover, the effect of tumor size on cancer-specific survival (CSS) was evaluated using Kaplan-Meier analysis. Results The study involved 87,355 patients in the study cohort and 65,858 in the validation cohort. Of the study cohort, 52.3% were diagnosed with RCC. The median age was 64 years old, with 48.5% females and 76.8% of white people. In addition, stage II RCC showed better CSS compared with LCC (5-year CSS 88.0% vs 85.5%, P < 0.001), while stage III/IV RCC demonstrated poorer outcomes. Multivariate Cox regression analysis identified that the right-sidedness was a positive prognostic factor in stages I/II but negative in stages III (HR 1.10, P < 0.001) and IV (HR 1.26, P < 0.001). Chemotherapy rates decreased in RCC, particularly in stage II (RCC vs LCC: 16.2% vs 28.5%, P < 0.001). Subgroup analysis, stratified by T3/T4 stages and chemotherapy status, further highlighted better survival outcomes in RCC. Conclusions RCC is associated with a significantly better prognosis in stage II. The importance of considering tumor-sidedness in clinical decision-making and the design of future clinical trials should be emphasized.
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Affiliation(s)
- Yun Yang
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, P. R. China
- State Key Lab of Digestive Health, Beijing Friendship Hospital, Beijing, P. R. China
- National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Beijing, P. R. China
| | - Xiaobao Yang
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, P. R. China
- State Key Lab of Digestive Health, Beijing Friendship Hospital, Beijing, P. R. China
- National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Beijing, P. R. China
| | - Zhigang Bai
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, P. R. China
- State Key Lab of Digestive Health, Beijing Friendship Hospital, Beijing, P. R. China
- National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Beijing, P. R. China
| | - Xiaozhe Gu
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, P. R. China
- State Key Lab of Digestive Health, Beijing Friendship Hospital, Beijing, P. R. China
- National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Beijing, P. R. China
| | | | | | | | - Zhongtao Zhang
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, P. R. China
- State Key Lab of Digestive Health, Beijing Friendship Hospital, Beijing, P. R. China
- National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Beijing, P. R. China
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