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- W3122440981 abstract "Background Methotrexate is the most effective treatment in rheumatoid arthritis. Dose and clinical effect are related. Objectives To determine predictive factors for reaching a dose of > 12.5 mg/week and effectivity. Methods Data from a double-blind placebo controlled multicenter study on patients with active rheumatoid arthritis were used. In this trial the effect of folic acid (1‑2 mg/day), folinic acid (2.5 mg/week) and placebo along methotrexate therapy (7.5-maximum 25 mg/week) was compared. The patients never had methotrexate before, had active disease and a creatinine clearance >50 ml/min. The three groups contained 133, 141 and 137 patients respectively. The follow-up was 48 weeks. By means of multiple stepwise regression analysis we studied the relation between baseline variables and the following: methotrexate dose > 12.5 mg/week and effectivity (lowest DAS1.08). Results Effectivity: We found no significant relation between baseline characteristics and effectivity. When we only look at a change in DAS >1.08 the disease duration (months) is significantly associated (p = 0.035) (P = 0.678 + 0.0015 disease duration) Methotrexate dose > 12.5 mg/week: Reaching a dose > 12.5 mg/week is significantly associated with folate suppletion (p (P = 0.678–0.292 no folate – 0.013GI-history) Conclusion Baseline characteristics do not predict effectivity. A positive gastro-intestinal history had a small negative effect on methotrexate dose. Reaching a high dose methotrexate is mainly predicted by folate suppletion. This is most likely explained by a reduction of toxicity. Our results suggest that when using folate adjuvant therapy, a weekly methotrexate dose of > 12.5 mg/week will be reached in 68%. Thus, with adjuvant folate, starting methotrexate therapy at a weekly dose of 15 mg seems justified." @default.
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- W3122440981 date "2001-06-01" @default.
- W3122440981 modified "2023-09-23" @default.
- W3122440981 title "FRI0016 Factors predicting methotrexate dose and effectivity" @default.
- W3122440981 doi "https://doi.org/10.1136/annrheumdis-2001.1145" @default.
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