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Aim The aim of this study was to seek an association between the control of type 2 diabetes mellitus (T2DM), as determined by hemoglobin A1c (HbA1c) levels, and the outcome of colorectal cancer (CRC). Methods We performed a retrospective review of patients with T2DM who had CRC diagnosed between 1997 and 2001. We defined well-controlled T2DM as HbA1c < 7.5% and poorly controlled T2DM as HbA1c ≥ 7.5%. A group of age- and gender-matched patients who had CRC without T2DM were used as controls. Forty clinical factors were reviewed, and those associated with poor clinical outcome in each group were examined by univariate analysis (UA) and by the maximum likelihood analysis of logistic regression to determine the independent predictors of cancer outcome. Results We identified 155 patients with T2DM and CRC, and 114 control patients who had CRC without T2DM. We found no …