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2006 Abstracts: Clinicopathological Factors Predictive of Systemic Recurrence after Curative Resection of Stage II Colon Cancer
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Clinicopathological Factors Predictive of Systemic Recurrence after Curative Resection of Stage II Colon Cancer
Yee Man Lee, Wai Lun Law, Hok Kok Choi, Chi Leung Seto, Siu Hung Lo, Wai Chu Ho; Surgery, Queen Mary Hospital, Hong Kong SAR, Hong Kong

Background: The use of adjuvant chemotherapy in stage II colon cancer remains controversial. Identification of risk factors associated with poor outcome can help to select patients for chemotherapy. Objective: To identify clinicopathological factors predictive of systemic recurrence in patients having curative resection for stage II colon cancer. Method: A prospective review on clinical data of all patients having curative resection for stage II colon cancer in a single tertiary centre from 1996 to 2003. The primary outcome measure was systemic recurrence. Secondary outcome measures included overall survival and disease free survival. Patients were assigned to group I (no recurrence) or group II (recurrence). Analysis on survival data was performed with Kaplan Meier test.Univariate analysis was performed using log-rank test and multivariate analysis was performed using Cox proportional hazards regression model. Results: The study comprised of 315 and 61 patients in group I and II, respectively. The median age was 72 years in both groups, there was no difference in distribution of gender.The median overall survival were 39.8 months in group I and 26.5 months in group II (p < 0.001). Median disease free survival were 39.8 months and 18.5 months, respectively (p<0.001). The median number of lymph nodes harvested were 11 and 10 in group I and II, respectively (p=0.725). Three clinicopathological factors were found significant for systemic recurrence in both univariate and multivariate analyses: emergency operation (hazard ratio 2.22, 95% CI 1.27 - 3.86), anastomotic leakage (hazard ratio 3.34, 95% CI 1.27 - 8.77) and perineural permeation (hazard ratio 3.01, 95% CI 1.23 - 7.25). Other factors included in analysis but not significant were resection margin < 5cm, T stage, differentiation of tumour, lymphovascular permeation, presence of mucin and signet ring cells. Conclusion: Adjuvant chemotherapy may be offered to patients operated in emergency setting, complicated by anastomotic leakage or whose tumour showed perineural permeation after curative resection for stage II colon cancer.


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