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  • Title: The ten-year single-center experience with 6-mercaptopurine in the treatment of inflammatory bowel disease.
    Author: Glazier KD, Palance AL, Griffel LH, Das KM.
    Journal: J Clin Gastroenterol; 2005 Jan; 39(1):21-6. PubMed ID: 15599205.
    Abstract:
    GOALS: To report the 10-year experience of a single center in treating patients with refractory inflammatory bowel disease (IBD) with relatively lower dose of 6-mercaptopurine (6-MP). STUDY: The charts of 285 patients with IBD (Crohn's disease 160 and ulcerative colitis 125) receiving 6-MP were reviewed. Clinical response, subsequent breakthrough while taking 6-MP, and relapse rates when 6-MP was discontinued and side effects were assessed. RESULTS: Ninety-three percent of the patients were taking 50 to 75 mg/day of 6-MP. Complete remission was achieved in 62%, partial remission in 14.5%, and failure to achieve remission in 23.5% of the patients. Of complete responders, 27.5% had breakthrough while continuing 6-MP. Nine percent of those that achieved a complete remission experienced a relapse after 6-MP was discontinued. Side effects included leukopenia (11.2%), abnormal liver function tests (3.8%), various infections, including pneumonia (3.1%), pancreatitis (2.5%), nausea (2.1%), headache (2.8%), fever (1.4%), hair loss (1%), and rash (0.7%). Two cancers occurred while taking 6-MP: melanoma on the finger and a fatal colonic lymphoma. Four patients continued 6-MP throughout pregnancies and had normal outcomes. CONCLUSIONS: In our experience 6-MP is relatively safe and appears to be as effective at a lower dosage (0.84 mg/kg per day) compared with the recommended higher dosage (1-1.5 mg/kg per day), when leukopenia was more frequent. Serious side effects, although rare, need to be monitored.
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