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Is tumor growth faster with obstructive colonic cancer?
1General Surgical Unit, Department of Surgery, Chonburi Hospital, Chonburi, Thailand. surawutch@gmail.com
Background:
It is generally known that long duration of untreated colonic cancer can lead to obstruction. Another contributing factor might be tumor growth rate. The present study was conducted to compare tumor growth rates related to lymph node metastasis of the obstructive and non-obstructive colonic cancers.
Methods:
169 patients who underwent operations for colonic cancer were studied retrospectively. Patient and tumor characteristics as well as clinical outcomes were analyzed.
Results:
94 patients (55.6%) presented with obstructed colonic cancers, and 75 (44.4%) with non-obstructed, 78.7% and 57.3%, respectively having a tumor size greater than 5 cm. On logistic regression analysis, both groups had similar lymph node metastasis rates (OR=1.6; 95% CI=0.8-3.2).
Conclusion:
No relations between obstruction and tumour size or lymph node metastasis were found. Thus, obstructions only occur because of other factors and do not contribute to tumor growth. Utilizing effective screening programs to determine obstructions is recommended.
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