Comparison of 627 patients with right- and left-sided colon cancer in China: Differences in clinicopathology, recurrence, and survival
- Author:
Qin QIONG
1
;
Yang LIN
;
Sun YONG-KUN
;
Ying JIAN-MING
;
Song YAN
;
Zhang WEN
;
Wang JIN-WAN
;
Zhou AI-PING
Author Information
1. Department of Medical Oncology, Tianjin Medical University General Hospital, Tianjin 300052, China
- Publication Type:Journal Article
- Keywords:
Colon cancer;
Location;
Recurrence;
Survival
- From:
Chronic Diseases and Translational Medicine
2017;3(1):51-59
- CountryChina
- Language:English
-
Abstract:
Objective: Recent studies have reported increased mortality for right-sided colon cancers; however, the results are conflicting for different stage tumors. We examined the differences in clinicopathology between right- and left-sided colon cancers and the re-lationships between colon cancer location (right- and left-side) and 5-year disease-free survival (DFS) and overall survival (OS). Methods: We identified patients from 2005 to 2008 with stage Ⅱ/Ⅲ colon cancer who underwent surgery for curative intent. We explored the impact of the tumor location on the postoperative DFS and OS using univariate and multivariate analyses. Results: Of 627 patients, 50.6% (317/627) had right-sided colon cancer. These patients were more likely to have weight loss, second primary tumor, elevated preoperative carbohydrate antigen 19-9 (CA19-9), increased incidence of non-adenocarcinoma, more poorly differentiated tumors, vascular invasion, defective mismatch repair, and a lighter smoking history (P < 0.05). Right-sided colon cancer had a higher recurrence incidence compared with left-sided cancer (30.6% vs. 23.2%, P = 0.037), particularly with multiple metastatic sites in the first recurrence (17.5% vs. 5.6%, P = 0.020). Kaplan-Meier survival curves demonstrated a significant difference in the 5-year DFS rate between right- and left-sided cancers across all stages (68.1% vs. 75.2%, P = 0.043). However, there was no significant difference in the 5-year OS rate between the two groups (73.8% vs. 79.0%, P = 0.103). Subgroup analysis demonstrated that patients with left-sided colon cancer had a significantly better 5-year DFS and OS rates compared with those with right-sided disease at stage Ⅲ (64.3% vs. 46.8%, P = 0.002; 69.5% vs. 53.5%, P = 0.006, respectively); there were no significant differences in the 5-year DFS and OS rates at stage Ⅱ (85.2% vs. 85.9%, P = 0.819; 89.8%vs. 88.5%, P = 0.803, respectively). Adjusted Cox regression analysis showed no significant differences in the 5-year OS and DFS rates for stage Ⅱ [hazard ratio (HR) = 1.203, 95% confidence interval (CI): 0.605-2.391, P = 0.598; HR = 0.980, 95% CI: 0.542-1.774, P = 0.948, respectively] or all stages combined (HR = 0.867, 95% CI: 0.613-1.227, P = 0.421; HR = 0.832, 95% CI: 0.606-1.142, P = 0.255, respectively). However, stage Ⅲ left-sided cancer had higher 5-year OS and DFS rates (HR = 0.626, 95% CI: 0.414-0.948, P = 0.027; HR = 0.630, 95% CI: 0.428-0.926, P = 0.019, respectively). Conclusion: We found that right- and left-sided colon cancers had significantly different clinicopathological characteristics. Right-sided colon cancer had a higher incidence of recurrence than left-sided disease. Patients with stage Ⅲ right-sided colon cancer had a worse prognosis compared with those with stage Ⅲ left-sided colon cancer.
