Purpose: The purpose of this study was to investigate the characteristics and the outcomes of primary colorectal lymphomas using a population-based registry.
Methods: All cases of colorectal lymphoma diagnosed between 1980 and 2007 were identified using a provincial cancer registry. Patients meeting Dawson's criteria and having a negative bone marrow biopsy were included.
Results: One hundred ten cases of colorectal lymphoma were identified, 43 met the inclusion criteria. The majority of patients was male (86%), and the median age at diagnosis was 62 (range 26-82) years. Tumors were mostly located in the cecum (51.1%) and rectum (20.9%). The 5-year overall survival rate calculated by the Kaplan-Meier method was 57%. Age under 60 was associated with a better median survival time (265 vs 54 months; p < 0.0001). The surgical treatment was associated with a better overall survival compared to medical treatment alone (110 vs 56 months; p = 0.083). Tumors located in the rectum were associated with a decreased overall survival (41 months vs 110 months; p = 0.065).
Conclusions: Primary colorectal lymphoma is a rare disease. The age at diagnosis is an important predictor of outcome. Surgical resection may be associated with improved survival. Rectal lymphoma appears to be associated with a worse outcome and may warrant more aggressive therapy.
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