alexa Pancytopenia secondary to methotrexate therapy in rheumatoid arthritis.
Orthopaedics

Orthopaedics

Journal of Arthritis

Author(s): GutierrezUrea S, Molina JF, Garca CO, Cullar ML, Espinoza LR

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Abstract OBJECTIVE: To assess the frequency of methotrexate (MTX)-induced pancytopenia in rheumatoid arthritis (RA). METHODS: A MEDLINE literature search was conducted to identify articles published during the last 15 years (1980-1995) that presented data on MTX-associated pancytopenia. Two case reports of our own experience are also presented. In addition, articles that examined risk factors associated with MTX-related pancytopenia were identified. RESULTS: A total of 70 patients with pancytopenia related to MTX therapy were identified (68 reported in the literature, 2 from our own experience). Sixty-one of the patients were described in published case reports, 7 patients were from 5 long-term prospective studies. In many of these cases, predisposing factors for the development of pancytopenia were described. The 5 long-term prospective studies reported toxicity data on patients who had been treated with MTX for at least 13 weeks. A total of 511 patients were included in the prospective trials, yielding an overall incidence of pancytopenia of 1.4\% (7 of 511). Of the 70 cases reported, 12 patients died (17\%). Most of them had impaired renal function, hypoalbuminemia, concurrent infection, and/or concomitant medication with more than 5 drugs. The minimal cumulative MTX dose leading to fatal pancytopenia was 10 mg, observed in one of our patients. CONCLUSION: Pancytopenia is not an uncommon side effect of low-dose pulse MTX therapy in RA. It can lead to serious complications, including death.
This article was published in Arthritis Rheum and referenced in Journal of Arthritis

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