Acquired Epidermodysplasia Verruciformis Occurring in a Renal Transplant Recipient
Acquired epidermodysplasia verruciformis (EDV) is a rare condition occurring in patients with depressed cellular immunity, particularly individuals with human immunodeficiency virus (HIV). Acquired EDV is less commonly reported in recipients of stem cell or solid organ transplantation. This condition typically manifests within 5 years of initial immunosuppression and can present as multiple hypopigmented to red, tinea versicolor–like macules or as multiple verrucous, flat-topped papules distributed over the trunk, arms, and legs. Human papillomavirus (HPV) types 5 and 8 are the most commonly isolated EDV-HPV subtypes as well as the most oncogenic subtypes, carrying the greatest risk for malignant transformation into squamous cell carcinoma (SCC). We present the case of a 44-year-old renal transplant recipient who developed multiple hypopigmented papules on the chest and neck with histopathology showing characteristic changes of EDV.
Practice Points
- Acquired epidermodysplasia verruciformis (EDV) is a rare complication of iatrogenic immuno-suppression in the setting of solid organ transplantation.
- Patients with EDV should be counseled to avoid exposure to UV radiation to reduce the risk formalignant transformation.
Comment
Epidermodysplasia verruciformis was first recognized as an inherited condition, most commonly inherited in an autosomal-dominant fashion; however, X-linked recessive cases have been reported.4,5 Patients with the inherited forms of this condition are prone to recurrent HPV infections secondary to a missense mutation in the epidermodysplasia verruciformis 1 and 2 genes, EVER1 and EVER2, on the EV1 locus located on chromosome 17q25.6 Because of this mutation, the patient’s cellular immunity becomes weakened. Cellular presentation of the EDV-HPV antigen to T lymphocytes becomes impaired, thereby inhibiting the body’s ability to successfully clear itself of the virus.5,6 The most commonly isolated EDV-HPV subtypes are HPV-5 and HPV-8, but HPV types 9, 12, 14, 15, 17, 19, 20, 21, 22, 23, 24, 25, and 50 also have been associated with EDV.1,3,7
Patients who have suppressed cellular immunity, such as transplant recipients on long-term immunosuppressant medications and individuals with HIV, graft-vs-host disease, systemic lupus erythematosus, and hematologic malignancies, are susceptible to EDV, as well as patients with atopic dermatitis being treated with topical calcineurin inhibitors.2,3,8-15 These patients acquire depressed cellular immunity and become increasingly susceptible to infections with the EDV-HPV subtypes. When clinical and histopathologic findings are consistent with EDV, a diagnosis of acquired EDV is given, which was further confirmed in a study conducted by Harwood et al.16 They found immunocompromised patients carry more EDV-HPV subtypes in skin lesions analyzed by polymerase chain reaction than immunocompetent individuals.16 Additionally, there is a positive correlation between the length of immunosuppression and the development of HPV lesions, with a majority of patients developing lesions within 5 years following initial immunosuppression.1,7,10,17
Epidermodysplasia verruciformis commonly presents with multiple hypopigmented to red macules that may coalesce into patches with a fine scale, clinically resembling the lesions of pityriasis versicolor.2,3,8-15 Epidermodysplasia verruciformis also may present as multiple flesh-colored, flat-topped, verrucous papules that clinically resemble the lesions of verruca plana on sun-exposed areas such as the face, arms, and legs.9 The characteristic histopathologic findings are enlarged keratinocytes with perinuclear halos and blue-gray cytoplasm as well as hypergranulosis.18 Immunocompromised hosts infected with EDV-HPV histologically tend to display more severe dysplasia than immunocompetent individuals.19 The differential diagnosis includes pityriasis versicolor, squamous cell carcinoma (SCC), and verruca plana. Tissue cultures and potassium hydroxide scrapings for microorganisms should be negative.
,The specific EDV-HPV strains 5, 8, and 41 carry the highest oncogenic potential, with more than 60% of inherited EDV patients developing SCC by the fourth and fifth decades of life.16 Unlike inherited EDV, the clinical course of acquired EDV is less well known; however, UV light is thought to act synergistically with the EDV-HPV in oncogenic transformation of the lesions, as most of the SCCs develop on sun-exposed areas, and darker-skinned patients seem to have a decreased risk for malignant transformation of EDV lesions.4,9,20,21 Preventative measures such as strict sun protection and annual surveillance of lesions can help to prevent oncogenic progression of the lesions; however, several single- and multiple-agent regimens have been used in the treatment of EDV with variable results. Topical imiquimod, 5-fluorouracil, tretinoin, and tazarotene have been used with variable success. Acitretin alone and in combination with interferon alfa-2a also has been used.22,23 Highly active antiretroviral therapy in patients with HIV has effectively decreased the number of lesions in a subset of patients.24 We (anecdotal) and others25 also have had success using photodynamic therapy. Squamous cell carcinoma arising in patients with EDV can be managed by excision or by Mohs micrographic surgery.
Conclusion
We report a rare case of acquired EDV in a solid organ transplant recipient. Epidermodysplasia verruciformis can be acquired in immunosuppressed patients such as ours, and these patients should be followed closely due to the potential for malignant transformation. More studies regarding the anticipated clinical course of skin lesions in patients with acquired EDV are needed to better predict the time frame for malignant transformation.
