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Background: Leukemia is the most common type of cancer in children which its relapse decreases the patients’ survival rate. The aim of this study was to determine the risk factors involved in leukemia relapse in patients in Shahid Faghihi Hospital, Shiraz, during 2004-2009 years. Materials and Methods: In this retrospective cohort study, 280 patients with acute lymphoblastic leukemia and acute myeloid leukemia were included. Patient characteristics were analyzed with respect to their association with recurrence through Chi-square test, Fisher’s exact test, and logistic regression model using SPSS software version 16 (P-value<0.05). Results: Logistic regression model revealed a statistically significance relationship between age and recurrence of the disease (odds ratio (OR) = 0.35, 95% confidence interval (CI) = 0.15-0.82), odds ratio of relapse in the 5-10 years old age group was 0.35 times more than the 0-5 years old age group (p=0.01). Conclusion: Noticing the greater likelihood of relapse in 0-5 years old age group compared with the 5-10 years old age group, more attention and better follow-up for decreasing the side effects of the disease and enhancing the survival rate of the 0-5 y/o age group are recommended.

Keywords: Acute lymphoblastic leukemia, Acute myeloblastic leukemia, Relapse, Risk factors

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