Original article
Treatment of coexistent psoriasis and lupus erythematosus

https://doi.org/10.1016/j.jaad.2014.10.038Get rights and content

Background

The coexistence of psoriasis and lupus erythematosus (LE) is rare. Anecdotal evidence suggests that anti–tumor necrosis factor alfa (TNF-α) agents may be efficacious in LE, although their use is commonly avoided in this disease because of concern for lupus flare.

Objective

We sought to describe the epidemiology, serologic findings, and therapeutic choices in patients with coexistent psoriasis/psoriatic arthritis and LE and to determine the risk of lupus flares with TNF-α inhibitors.

Methods

We performed a retrospective multicenter study of patients given the diagnoses of psoriasis (or psoriatic arthritis) and lupus erythematosus (systemic LE or cutaneous LE, including either subacute cutaneous LE or discoid LE) at 2 academic tertiary-care centers.

Results

A total of 96 patients with a mean age of 56 years was included. We report higher-than-expected rates of white race and psoriatic arthritis. One clinical lupus flare was observed in a patient receiving a TNF-α inhibitor, resulting in an incidence of 0.92% lupus flares per patient-year of TNF-α inhibitor use.

Limitations

Retrospective chart review, small sample size, and limited documentation.

Conclusion

Anti–TNF-α agents, ustekinumab, and abatacept may be valid treatment options for patients with concomitant LE and psoriasis. Clinical lupus flares in LE patients treated with TNF-α inhibitors were infrequent.

Introduction

Psoriasis (Ps) and lupus erythematosus (LE) are immune-mediated diseases. Whereas Ps is primarily characterized by upregulation of the helper T cell (Th) 17 and Th1 immune pathways, LE is associated with upregulation of the Th1, Th2, and Th17 pathways, with constitutive B cell activation and autoantibody production.1, 2, 3, 4

Ps is common, affecting 1% to 3% of the US population,5 whereas LE is much less common: Reported prevalence rates for SLE in the United States range from 20 to 150 cases per 100,000 for SLE.6 Cutaneous LE (CLE; including discoid LE [DLE] and subacute cutaneous LE [SCLE]) has similar prevalence rates.7 The coexistence of LE with Ps is rare.

Medications commonly used for LE, such as mycophenolate mofetil and azathioprine, are not particularly efficacious in cutaneous Ps therapy, and antimalarials are known to make Ps worse. Likewise, ultraviolet light phototherapy, used for many patients with cutaneous Ps, is generally avoided in SLE and CLE because of risk of photosensitivity or lupus exacerbation. Although TNF-α inhibitors are a well-established therapy for Ps, they often are avoided in LE because of the unclear role of TNF-α in the disease and reports of TNF-α inhibitor–induced LE and induction of antinuclear antibodies.8, 9, 10, 11, 12

The most recent case series of patients with concomitant Ps and LE was published in 1980.13 We present a comprehensive case review of 96 patients from 2 academic medical centers with Ps or psoriatic arthritis (PsA) plus LE (systemic lupus erythematosus [SLE], DLE, or SCLE). We aimed to determine the risk of clinical LE flare with use of the TNF-α inhibitors and to evaluate clinical outcomes resulting from the use of biologics in patients with Ps and SLE/CLE.

Section snippets

Methods

After local Institutional Review Board approval, a retrospective chart review of patients with coexistent psoriatic and SLE/CLE was performed at 2 tertiary-care academic institutions: Tufts Medical Center and Brigham & Women's Hospital.

Electronic and paper chart reviews of patient medical history and laboratory and pathology reports were performed. Medical records from January 1990 to February 2013 were available from the Brigham & Women's Hospital, and records from 2007 to 2013 were available

Results

Ninety-six patients fulfilled inclusion and exclusion criteria (Table I). Eighty-four (87.5%) patients were women and 12 (12.5%) were men (Table II). Most (77.1%) patients (including those with SLE or CLE) were white and had chronic plaque Ps (81.3%). In patients with SLE/CLE, Ps was present in 87 (90.6%) and PsA in 50 (52.1%). Forty patients (42.7%) had both Ps and PsA in addition to LE. Nine patients (9.4%) had LE and PsA (per clinical documentation) without cutaneous Ps. There were 85

Discussion

Cases of coexistent Ps and LE are uncommon. The 2 diseases have relatively disparate pathophysiologic mechanisms, although they share upregulation of the Th17 immune pathway with elevated levels of interleukin (IL)-17, IL-23, and IL-12.1, 2, 16 Most cases of concomitant Ps/PsA and LE in the literature are anecdotal reports and small case series.13, 17, 18, 19, 20 The most recent review of patients with coexistent LE and Ps was published in 1980 by Millns and Muller13 and presented an analysis

Conclusion

The pathophysiology of Ps/PsA arthritis occurring with SLE, DLE, or SCLE, although uncommon, may be related to the diseases' shared pathophysiology of the Th17 and Th1 immune pathways. Coexistent disease is rare but often difficult to treat, sometimes requiring multiple immunosuppressive medications with cumulative long-term toxicities.

We report on a predominantly white, female population with a higher incidence of cutaneous photosensitivity and PsA than would be expected in the presence of

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    Funding sources: None.

    Conflicts of interest: None declared.

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