Treatment of Imiquimod Resistant Epidermodysplasia Verruciformis With Ingenol Mebutate

March 2016 | Volume 15 | Issue 3 | Case Report | 350 | Copyright © 2016

Carey Kim MS,a Pantea Hashemi MD,b Michael Caglia MD,c and Kenneth Shulman MDd

aNew York Medical College, Valhalla, NY
bKaiser Permanente, Rancho Cordova, CA
cDepartment of Dermatology, New York Medical College, New York, NY

Abstract

BACKGROUND: Epidermodysplasia verruciformis (EV) is a rare genetic disorder characterized by widespread human papillomavirus (HPV) associated lesions and an increase susceptibility to cutaneous malignancies. A host of medications traditionally used to treat warty lesions have been used with variable results and limited success. To our knowledge, we describe the first reported case of a patient with Imiquimod resistant EV successfully treated with topical ingenol mebutate (Picato).
CASE: A patient with a 5 year history of EV failed to respond to a 6 week course of 5% imiquimod on the forehead and was subsequently treated with a 3 day course of 0.015% Picato gel which resulted in significant clinical improvement. A one month follow-up examination showed no reoccurrence of the lesions with the patient reporting continued satisfaction of the outcome.
CONCLUSION: Our case provides insight into the potential use of ingenol mebutate for EV patients unresponsive to traditional medical treatments.

J Drugs Dermatol. 2016;15(3):350-352.

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INTRODUCTION

Epidermodysplasia verruciformis (EV) is a rare genodermatosis associated with persistent HPV susceptibility and the subsequent development of generalized verrucae and flat warts with brown to reddish tinea versicolor-like lesions commonly localized to the face, extremities, back, and in other sun exposed areas. These lesions begin during childhood and progressively increase in size and severity with 30-60% of patients experiencing cutaneous malignant transformations by the fourth decade.1 HPV genotypes 5 and 8 account for more than 90% of HPV associated malignancies.1 Several loci have been identified which suggests a dysfunction in the cell-mediated immunity or a dysregulation in intracellular zinc transport.1,2 Current medical therapies have been aimed at stimulating the immune response and slowing the development and progression of cancers with medications like imiquimod, retinols, cimetidine, and 5- fluorouracil. These treatments can produce systemic side effects, require long-term application, and lesions often reoccur with poor results upon discontinuation.3-5

The current treatment therapies for EV are not optimal. Ingenol mebutate, a medication recently reported as an effective treatment for actinic keratoses, is a potential candidate for treating EV.6 We report a case of imiquimod resistant EV with significant clinical improvement after application of a 3-day course of ingenol mebutate.

CASE

A 38 year-old female with no prior medical history presented with multiple annular lesions/plaques on the head, torso, and lower extremities with erosions and ulcerations localized to the face. The patient noted the lesions began 5 years ago and progressively worsened particularly along sun exposed areas. The patient was unemployed for several years and reported no previous radiation or chemical exposures. Her parents are non-consanguineous and there is no family history of similar skin lesions or cutaneous malignancies. Initial dermatological examination revealed a 2 x 2.5 cm ulceration with pearly borders on the right scalp, multiple scattered hyperpigmented and crusted papules and erosions on the forehead, and several discrete pink papules on bilateral knees, and upper back (Figure 1).

Multiple shave biopsies were taken for histologic examination. Two biopsies from the right scalp and forehead were invasive SCC (Figure 2). A biopsy from the left thigh was a benign verruca with characteristic histologic changes of EV. Additional biopsies confirmed SCC in situ of the left forehead and left lateral hairline with associated changes of EV (Figure 3). The patient was consulted on minimizing sun exposure and advised to regularly apply UV protection. The two invasive SCC were surgically excised. Medical treatment with 5% Imiquimod (Aldara) 5 times a week for 6 weeks was begun with minor improvement.

The patient returned three months later for additional biopsies of lesions on the face including a basal cell carcinoma (BCC) on the forehead, SCCIS on the right zygoma, and invasive

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