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• W1811455931 abstract "Summary Background Methotrexate is activated by the sequential addition of glutamic acid residues to form methotrexate polyglutamates (MTXPG1–5). MTXPG1–5 inhibit enzymes of the folate–purine–pyrimidine pathways, and longer-chain MTXPG3–5 species are more active. Objectives To determine the pattern of erythrocyte MTXPG1–5 in patients initiated on oral methotrexate for psoriasis, and to investigate the potential utility of MTXPGs as markers of compliance and/or clinical response. Methods This was a single-centre, prospective study of 55 adult patients with chronic plaque psoriasis initiated on weekly oral methotrexate. Erythrocyte MTXPG1–5 concentrations were measured (at weeks 4, 8, 12, 24 and 52) using high-performance liquid chromatography. Methotrexate responders achieved ≥ 50% improvement in Psoriasis Area and Severity Index or physician’s global score of ‘clear’/‘nearly clear’ at 24 weeks. Results MTXPG levels were measured in 14–33 patients at each time point. All MTXPG1–5 species were detected at week 4 of therapy. Steady state for long-chain MTXPG3–5 and total MTXPG1–5 was achieved by week 24. MTXPG3 emerged as the predominant MTXPG species (from week 12 onwards) and reflected overall polyglutamate status (correlating strongly with MTXPG2–5, MTXPG3–5 and MTXPG4–5; R = 0·76–0·95, P < 1·55 × 10−5). Age, renal function and sex were not significant determinants of MTXPG3 concentration. No significant association was identified between MTXPG and adverse events or responder status. Conclusions This is the first study to demonstrate the prospective accumulation of MTXPG1–5 in patients with psoriasis. The detection of MTXPGs early in therapy and the establishment of a steady state with continuous treatment may offer measuring of MTXPG as a test to monitor patient compliance with therapy. Larger studies are required to determine the role of MTXPG as a potential biomarker of clinical response." @default.
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• W1811455931 date "2012-06-28" @default.
• W1811455931 modified "2023-09-26" @default.
• W1811455931 title "Methotrexate polyglutamates as a marker of patient compliance and clinical response in psoriasis: a single-centre prospective study" @default.
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• W1811455931 doi "https://doi.org/10.1111/j.1365-2133.2012.10881.x" @default.
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