A prospective clinical trial of open-label etanercept for the treatment of hidradenitis suppurativa

Background

Medical therapies for hidradenitis suppurativa (HS) are often ineffective. Tumor necrosis factor-α inhibitors may be a potential treatment for patients with moderate to severe HS.

Objectives

We sought to evaluate the safety and efficacy of etanercept for patients with severe HS.

Methods

We conducted a phase II clinical trial of etanercept (50 mg/wk subcutaneously) in patients with moderate to severe HS. Efficacy was measured using a Physician Global Assessment and several secondary physician- and patient-reported outcome measures. Responders were classified as those achieving at least a 50% reduction on the Physician Global Assessment score at week 12 compared with baseline.

Results

Only 3 of the 15 patients who entered the study were classified as responders (response rate of 20%; 95% confidence interval: 4.3-48.1) based on the intention-to-treat analysis. Dermatology Life Quality Index scores improved slightly from a median of 19 to 15 (P = .02). Comparison of baseline with week-12 Physician Global Assessment scores, and secondary outcome measures of lesion counts and patient pain scores, failed to show statistically significant improvement. Etanercept was generally well tolerated; however, two patients discontinued the study as a result of skin infections at the site of hidradenitis lesions requiring oral antibiotics.

Limitations

Lack of a control group and a small number of participants are limitations.

Conclusions

Our study demonstrated minimal evidence of clinically significant efficacy of etanercept (50 mg/wk subcutaneously) in the treatment of hidradenitis. Future studies using higher doses of etanercept are indicated; however, patients need to be carefully monitored for infection and other adverse events. Randomized, controlled trials will be necessary to demonstrate the risk-to-benefit ratio of tumor necrosis factor-α inhibitors in the treatment of hidradenitis.

Key words: clinical trial, efficacy, etanercept, hidradenitis suppurativa, quality of life, safety, tumor necrosis factor inhibitor

Abbreviations used: AT, as treated, BMI, body mass index, DLQI, Dermatology Life Quality Index, HS, hidradenitis suppurativa, ITT, intention to treat, PGA, Physician Global Assessment, SC, subcutaneously, TNF, tumor necrosis factor