Methotrextae (MTX) is an antifolate first developed to treat certain types of cancer. It was used at higher doses as a cancer therapy and since 1990 it is used at much lower doses to treat rheumatic diseases [1]. Side effects of MTX high dose (MTX-HD) may be life threatening, however those of various doses of oral MTX are variable because of the interindividual variability of gastrointestinal absorption of this drug. Bone marrow, gastrointestinal mucosa and hair are particularly vulnerable to the effects of MTX, secondary to their high rate of cellular turnover [2] and because MTX concentration is inversly proportianal to renal clearance [2], renal toxicity is frequent with MTX-HD.
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Gaïes et al. (2012) studied this question.
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