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Evidence-Based Dermatology: Review |

Off-label Use of Azathioprine in Dermatology:  A Systematic Review

Mandy E. Schram, MD; Rinke J. Borgonjen, MD; Cathelijne M. J. M. Bik, MD; Jan G. van der Schroeff, MD, PhD; Jannes J. E. van Everdingen, MD, PhD; Phyllis I. Spuls, MD, PhD; for the Off-Label Working and Project Group of the Dutch Society of Dermatology and Venereology
Arch Dermatol. 2011;147(4):474-488. doi:10.1001/archdermatol.2011.79.
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Objective  To summarize evidence regarding the effectiveness, efficacy, and safety of off-label azathioprine use in dermatology.

Data Sources  We searched the MEDLINE (1950-2009), EMBASE (1980-2009), and CENTRAL (1996-2009) databases on October 9, 2009. The main search terms were azathioprine and its synonyms. No restrictions were imposed regarding publication date. Only articles in English, French, German, or Dutch were included.

Study Selection  Randomized controlled trials, cohorts, and case series concerning the use of azathioprine in an off-label dermatologic setting were independently assessed for eligibility by 2 coauthors. The search retrieved 3870 articles, and 148 articles were selected for detailed review.

Data Extraction  Forty-three articles matching the inclusion and exclusion criteria were reviewed for methodologic quality by 2 reviewers independently, including an evaluation of components associated with biased estimates of treatment effect.

Data Synthesis  High-quality evidence (level A) was found for a moderate therapeutic effect in severe atopic dermatitis. Evidence of moderate quality (level B) was found for efficacy in parthenium dermatitis (an airborne plant allergen contact dermatitis), bullous pemphigoid, chronic actinic dermatitis, and leprosy type 1 reaction. Furthermore, favorable therapeutic effects existed for erythema multiforme, lichen planus, and pityriasis rubra pilaris, although the quality of evidence was low (level C).

Conclusions  A strong clinical recommendation was given for azathioprine in atopic dermatitis. Conclusions regarding safety in an off-label setting could not be reached because of scarce and incomplete data (level C evidence). Long-term registries and prospective studies could add to the existing evidence and provide legal support for off-label drug use in dermatology.

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Flowchart summarizing the selection process for studies concerning off-label azathioprine treatment in dermatologic diseases.

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