title: Prevalence of Anal Human Papillomavirus Infection and Risk Factors among HIV-positive Patients in Tokyo, Japan.
abstract: BACKGROUND
  Oncogenic human papillomavirus (HPV) infection, particularly multiple HPV types, is recognized as a necessary cause of anal cancer. However, a limited number of studies have reported the prevalence of anal HPV infection in Asia. We determined the prevalence, genotypes, and risk factors for anal HPV infection in Japanese HIV-positive men who have sex with men (MSM), heterosexual men, and women.
  
  
  METHODS
  This cross-sectional study included 421 HIV-positive patients. At enrollment, we collected data on smoking, alcohol, co-morbidities, drugs, CD4 cell counts, HIV RNA levels, highly active anti-retroviral therapy (HAART) duration, sexually transmitted infections (STIs), and serological screening (syphilis, hepatitis B virus, Chlamydia trachomatis, Entamoeba histolytica). Anal swabs were collected for oncogenic HPV genotyping.
  
  
  RESULTS
  Oncogenic HPV rate was 75.9% in MSM, 20.6% in heterosexual men, and 19.2% in women. HPV 16/18 types were detected in 34.9% of MSM, 17.7% of heterosexual men, and 11.5% of women. Multiple oncogenic HPV (≥2 oncogenic types) rate was 54.6% in MSM, 8.8% in heterosexual men, and 0% in women. In univariate analysis, younger age, male sex, MSM, CD4 <100, HIV viral load >50,000, no administration of HAART, and having ≥2 sexually transmitted infections (STIs) were significantly associated with oncogenic HPV infection, whereas higher smoking index and corticosteroid use were marginally associated with oncogenic HPV infection. In multivariate analysis, younger age (OR, 0.98 [0.96-0.99]), MSM (OR, 5.85 [2.33-14.71]), CD4 <100 (OR, 2.24 [1.00-5.01]), and having ≥2 STIs (OR, 2.81 [1.72-4.61]) were independently associated with oncogenic HPV infection. These 4 variables were also significant risk factors for multiple oncogenic HPV infection.
  
  
  CONCLUSIONS
  Among Japanese HIV-infected patients, approximately two-thirds of MSM, one-fifth of heterosexual men, and one-fifth of women have anal oncogenic HPV infection. Younger age, MSM, ≥2 STIs, and immunosuppression confer a higher risk of infection with oncogenic HPV and multiple oncogenic types.
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Naoyoshi
authors.initials: N
authors.lastname: Nagata
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nishijima
authors.affiliation: BML, Tokyo, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Tadokoro
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: Ohta Nishinouchi Hospital, Fukushima, Japan.
authors.forename: Takuro
authors.initials: T
authors.lastname: Shimbo
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Ryota
authors.initials: R
authors.lastname: Niikura
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Katsunori
authors.initials: K
authors.lastname: Sekine
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Akiyama
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Katsuji
authors.initials: K
authors.lastname: Teruya
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Gatanaga
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Yoshimi
authors.initials: Y
authors.lastname: Kikuchi
authors.affiliation: Department of Gastroenterology and Hepatology, National Center for Global Health and Medicine, Kohnodai Hospital, Chiba, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Uemura
authors.affiliation: AIDS Clinical Center, National Center for Global Health and Medicine, Tokyo, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Oka
mesh_terms: D000328:Adult; D000367:Age Factors; D001004:Anus Diseases / Q000453:epidemiology* / Q000821:virology; D003430:Cross-Sectional Studies; D005260:Female; D006679:HIV Seropositivity / Q000188:drug therapy / Q000453:epidemiology*; D052162:Human papillomavirus 16; D052161:Human papillomavirus 18; D006801:Humans; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D030361:Papillomavirus Infections / Q000453:epidemiology* / Q000821:virology; D012737:Sex Factors