The prevalence of anal human papillomavirus among young HIV negative men who have sex with men
© Zou et al.; licensee BioMed Central Ltd. 2012
Received: 20 September 2012
Accepted: 3 December 2012
Published: 9 December 2012
Men who have sex with men (MSM) especially those who are HIV positive are at risk for HPV-associated anal cancer. We systematically reviewed studies with data on the prevalence of vaccine preventable anal HPV among men who have sex with men aged 25 or younger and identified 6 studies. None of these studies were specifically designed to determine the prevalence of HPV in this population. Available data, albeit limited, suggest many young MSM may not already be HPV infected. Further studies using representative sampling focused on teenage MSM are required to confirm this.
KeywordsHuman papillomavirus (HPV) Men who have sex with men Prevalence
Genital human papillomavirus (HPV) infection is widespread [1–3] and usually asymptomatic . HPV types 6 and 11 are the types most commonly associated with anogenital warts , while types 16 and 18 are associated with HPV related malignancies including anal and cervical cancer [1–3, 6]. Studies demonstrate that the great majority of adult MSM are infected with multiple HPV types [7–9], with a substantial proportion infected with HPV 16 or 18, which together cause about 80% of anal cancers [10–12]. MSM especially those who are HIV positive are at increased risk for anal cancer .
The prophylactic quadrivalent HPV vaccine is effective in preventing infection with HPV types 6, 11, 16 and 18 and in reducing the incidence of anogenital warts and anal intraepithelial neoplasia in males [14, 15]. However, to date no countries have introduced universal, free vaccination of boys. The extent to which young MSM are already infected with HPV at the age at which targeted vaccination is available is not well documented. We therefore undertook a review of studies examining the prevalence of HPV among MSM aged 25 and younger.
We systematically reviewed studies by searching MEDLINE and abstracts from the European Research Organisation on Genital Infection and Neoplasia (EUROGIN) Conferences and the International Papillomavirus (IPV) Conferences. Key words used in the search included: “men who have sex with men” or “MSM” or “homosexual” or “bisexual” or “gay” and “human papillomavirus” or “HPV”.
The following data were extracted: author, year of publication, study setting, number of MSM, number of MSM aged 25 or younger, sample collection method, HPV DNA testing method, and HPV type tested. HPV 6/11/16/18 prevalence were extracted, and where possible, HPV 6/11/16/18 prevalence stratified by age group (≤20 years old; 21–25 years old; ≤25 years old).
Overview of studies with data on anal HPV detection among men who have sex with men aged ≤ 25 years
No. MSM <=25a
Sample collection method
HPV DNA testing method
HPV types tested
(i) Homosexual men attending an STD clinic in Seattle (ii) Homosexual men attending a community-based clinic for HIV screening in Seattle
(i) Age 16–50; being homosexual or bisexual. (ii) Age ≥18; having sex with other men
PCR; primers MY09 and MY11
PCR: 6,11,16,18,31 33, 35,39 and 45
Moscicki, 2003 
Adolescents in primary care centres in 13 US cities who were at high risk of HIV infection
Age 13–18; having high-risk behaviours and/or injecting drug use
PCR, primers MY09, MY11 and HMB01
16,18,31,33,39,42, 44,45,51,52, 56 and 58
MSM from the general population, universities, STD clinics and organized health care systems in Sao Paulo, Cuernavaca, Tampa.
Age 18–70; having no prior penile or anal cancer or genital warts and no current HIV/STD diagnosis
PCR;the QIAamp Media MDx kit (Qiagen); primers PGMY09/11
6,11,16,18,26,31,33, 35,39,40,42,45, 51–56,58,59,61,62,64, 66–73,81-84, IS39 and CP6108
Gilbert, 2011 
MSM recruited from bars, festivals, associations, community events, bathhouses, and businesses in Vancouver
Age ≥19; identifying as a man who has ever had sex with men
PCR; PCR and Linear Array kit (Roche); primers PGMY.
36 types including 6,11,16,18
MSM in a randomized, placebo-controlled, double-blinded trial of HPV vaccination in 14 countries
Age 16–26; having ≤ 5 lifetime male and/or female sexual partners; having had penetrative intercourse, including oral sex
PCR; QIAamp DNA kit (Qiagen); primers based on published L1, E6 and E7 sequences.
6,11,16,18, 31,33,35,39, 45,51,52, 56, 58 and 59
The 6 studies included provided data on anal HPV for a total of 698 MSM aged ≤ 25. Among men aged ≤ 20, the prevalence of anal HPV 6, 11, 16 and 18 ranged from 0 to 17%, 0 to 17%, 0 to 14% and 0 to 20%, respectively. Among men aged 21 to 25, the prevalence of anal HPV 6, 11, 16 and 18 ranged from 8 to 19%, 0 to 8%, 0 to 18% and 3 to 8%, respectively.
Through this review, we found that there have been no published studies that have been designed to specifically determine the prevalence of HPV among young MSM using a representative sample of young MSM. Of the six studies identified, all had potential biases because of the way the studies were designed. These could have led to either an overestimate or an underestimate of the true HPV prevalence among young MSM. Several studies recruited men from clinics including STD clinics [7, 17, 18] while others had selection criteria that may have led to higher risk or lower risk men being included [15, 19]. Several studies recruited MSM across a wider age range leaving only a much smaller subset of younger MSM with data on HPV prevalence. Most data derive from a study that was designed to determine HPV vaccine efficacy in MSM rather than HPV prevalence . A further limitation is that all studies only reported HPV detection at a single time point rather than defining infection by the presence of the same HPV type present at two separate time points.
Despite these important limitations, the available data suggest HPV infection may still be uncommon among teenage same sex attracted males, although the data are currently insufficient to draw this conclusion with confidence. A community-based, representative sample is needed to determine the prevalence of HPV infection, defined rigorously, among mainly teenage same sex attracted males.
Given that HPV 16 and 18 are responsible for around 80% of anal cancers  and HPV 6 and 11 account for most genital warts  such a study would help to ascertain whether targeted HPV vaccination of young MSM is likely to be effective in preventing anal cancer in this group of at-risk males. Ideally, HPV vaccination should occur prior to the onset of sexual activity – ahead of potential HPV acquisition. To date, however, no country has implemented universal HPV vaccination of school aged boys, although the Australian Government has recently announced it is planning to roll out the HPV vaccination program to 12 and 13 years old schoolboys from 2013. Targeted vaccination of MSM to prevent anal cancer would likely only be effective if, in addition to low existing HPV rates, young same sex attracted males are willing to disclose their sexuality to health care providers in order to obtain the HPV vaccine. Further studies to determine the acceptability and feasibility of targeted vaccination of young same sex attracted males are required.
Men who have sex with men
European Research Organisation on Genital Infection and Neoplasia
The International Papillomavirus Society
Sexually transmitted diseases.
We are grateful to the following people who kindly provided us with original data from their studies: Deoraj Caussy, Heidi Friedman, Elizabeth Garner, Mark Gilbert, Anna Giuliano, James Goedert, Stephen Goldstone, Richard Haupt, Stephen Hawes, Travis Salway Hottes, Nancy Kiviat, Yifei Ma, Jennifer Brooke Marshall, Anna Barbara Moscicki, Alan Nyitray, Gina Ogilvie, Joel Palesfky, Maria Alejandra Picconi, Claudia Rank, Eric van der Snoek, Claire Vajdic and Rianne Vriend. We would like to thank Lyle Gurrin, Minh Bui, Eric Chow, Nan Hu, Fengyi Jin, Dorothy Machalek and Lei Zhang for advice on data analysis.
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