High-grade Dysplasia in Anogenital Warts of HIV-Positive Men

Alexander Kreuter, MD1; Christos Siorokos, MD1; Frank Oellig, MD2; et al Steffi Silling and Others 13 Mar 2017
1422 volte

Do anogenital lesions of HIV-positive men that clinically appear as benign warts contain areas of dysplasia, and if so, what are the virological characteristics of those lesions? Findings  In this case series, a high proportion of anogenital warts contained areas of high-grade and low-grade dysplasia or even invasive cancer. Some of these lesions contained only low-risk-HPV types. Dysplasia was absent in all lesions of immunocompetent control patients.

Human papillomavirus (HPV)-induced anogenital lesions are very frequent in men who have sex with men (MSM) who are HIV-positive (HIV+). Anogenital warts (AGWs) are considered benign lesions caused by low-risk HPV-types, whereas anogenital dysplasias are potential cancer precursors associated with high-risk HPV-types. Both types of lesions can usually be distinguished clinically.

For this retrospective virological analysis, we recruited 25 HIV+ MSM with AGWs (n = 38) harboring areas of dysplasia and 22 patients who were HIV-negative (HIV−) with AGWs seen between February 2013 and March 2015 at a tertiary dermatological referral center for anal cancer screening. Dysplasia-containing AGW tissue of HIV+ MSM were compared with randomly selected AGWs of patients who were HIV−. Main Outcomes and Measures  Histopathological analysis, immunohistochemical staining for p16INK4a and Ki67, HPV-typing, and viral load determination in AGWs of HIV+ compared with patients who were HIV−.

Overall, 25 HIV+ MSM with AGWs (mean [SD] age, 47.3 [11.1] years) harboring areas of dysplasia and 22 patients who were HIV− (5 women, 17 men; mean [SD] age, 35.5 [12.8] years) with AGWs were included in this study. The 38 dysplasia-containing AGWs of HIV+ MSM harbored low-grade dysplasia in 6 cases (16%), high-grade dysplasia in 31 cases (81%), and areas of invasive anal carcinoma in 1 (3%) case. With the exception of 1 biopsy, all low-grade lesions were p16INK4a-negative, whereas 25 of 31 (81%) AGWs with high-grade lesions or an anal carcinoma were p16INK4a-positive. Only low-risk HPV-types were present in 11 samples (29%; 2 low-grade lesions and 9 high-grade lesions), low-risk and high-risk types were found in 19 samples (50%; 1 low-grade lesion and 18 high-grade lesions), and only high-risk HPV-types were present in 8 samples (21%; 3 low-grade lesions, 4 high-grade lesion, and 1 cancer-containing lesion). High low-risk HPV DNA loads were found in low-grade and high-grade lesions, while high high-risk HPV DNA loads were only found in AGWs harboring high-grade lesions. The 22 AGWs of patients who were HIV− showed no signs of dysplasia, and p16INK4a-staining was always negative. All of these samples carried low-risk HPV types, and in 2 cases high-risk HPV-types were detected additionally.

In contrast to immunocompetent patients, AGWs of HIV+ MSM may harbor high-grade dysplasia or even invasive squamous cell carcinoma. A substantial proportion of theses lesions may only contain low-risk HPV-types. Anogenital warts in patients who are HIV+ should be evaluated histopathologically to exclude cancer precursors.

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