Liver injury in long-term methotrexate treatment in psoriasis is relatively infrequent

M A M Berends1, J Snoek, E M G J de Jong

  • 1Department of Dermatology, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands. m.berends@derma.umcn.nl

Abstract

Insights

Methotrexate liver injury in psoriasis patients is less common than believed, with diabetes and obesity as key risk factors. Most liver damage occurred at cumulative doses under 6,000 mg.

Area of Science:

  • Dermatology
  • Hepatology
  • Pharmacology

Background:

  • Psoriasis treatment guidelines recommend liver monitoring due to concerns about methotrexate hepatotoxicity.
  • Emerging data suggests methotrexate may be less liver toxic than previously understood.

Purpose of the Study:

  • To assess the frequency and progression of liver injury in patients with psoriasis treated with methotrexate.
  • To identify risk factors associated with methotrexate-induced liver damage.

Main Methods:

  • Retrospective chart review of 125 psoriasis patients treated between 1976 and 2005.
  • Analysis of 278 liver biopsies to evaluate histology.
  • Statistical analysis to determine associations between methotrexate dosage, treatment duration, and liver injury.

Main Results:

  • Liver injury was observed but generally mild (71% Roenigk grade I).
  • Obesity and diabetes were significant risk factors for liver injury.
  • Liver histology did not change in 72% of patients with multiple biopsies; deterioration occurred in 25%.

Conclusions:

  • Methotrexate-related liver injury in psoriasis patients is less frequent than previously assumed.
  • Significant liver injury typically occurred at cumulative doses below 6,000 mg.
  • Diabetes and overweight status are strongly correlated with methotrexate hepatotoxicity.

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