title: Clinical effectiveness and cost-effectiveness of quadrivalent human papillomavirus vaccination in HIV-negative men who have sex with men to prevent recurrent high-grade anal intraepithelial neoplasia.
abstract: We examined the long-term clinical and economic benefits of quadrivalent human papillomavirus (qHPV) vaccine as a secondary/adjunct prevention strategy in the prevention of recurrent high-grade intraepithelial neoplasia (HGAIN) in HIV-negative men who have sex with men (MSM) and are 27 years or older. We constructed a Markov model to evaluate the clinical effectiveness and cost-effectiveness of two strategies: (1) no qHPV vaccine after treatment for HGAIN versus (2) qHPV vaccine after treatment for HGAIN. Model parameters, including natural history of anal cancer, vaccine efficacy measured in terms of hazard ratio (HR) (decrease in the risk of recurrent HGAIN), HGAIN treatment efficacy, utilities, and costs, were obtained from the literature. The outcomes were measured in terms of lifetime risk of anal cancer, lifetime cost, quality-adjusted life years, and incremental cost-effectiveness ratios (ICERs). Sensitivity analysis was conducted on all model parameters. We found that vaccinating HIV-negative MSM reduced the lifetime risk of anal cancer by 60.77% at an ICER of US$87,240 per quality-adjusted life-year. The results were highly sensitive to vaccine efficacy, transition of HGAIN to anal cancer, cost of treatment for HGAIN, vaccine degree of protection over time, and the vaccine duration of protection and less sensitive to HPV clearance, cost of qHPV vaccine, and the transitions from normal to low-grade anal intraepithelial neoplasia (LGAIN) and normal to HGAIN. With an HR of 0.3, the ICER was well below a $50,000 willingness-to-pay threshold; with an HR of 0.5, the ICER was still below a threshold of $100,000. The most critical disease-related factor influencing the cost-effectiveness was the progression of HGAIN to anal cancer. At an annual transition probability below 0.001, the ICER was below $50,000. Vaccinating HIV-negative MSM treated for HGAIN decreases the lifetime risk of anal cancer and is likely to be a cost-effective intervention.
authors.affiliation: Cancer Prevention Training Research Program, The University of Texas MD Anderson Cancer Center, Houston, TX, United States; Department of Health Services Research, The University of Texas MD Anderson Cancer Center, Houston, TX, United States.
authors.forename: Ashish A
authors.initials: AA
authors.lastname: Deshmukh
authors.affiliation: Department of Medicine, Section of Infectious Diseases, Baylor College of Medicine, Houston, TX, United States.
authors.forename: Elizabeth Y
authors.initials: EY
authors.lastname: Chiao
authors.affiliation: Department of Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, TX, United States.
authors.forename: Prajnan
authors.initials: P
authors.lastname: Das
authors.affiliation: Department of Health Services Research, The University of Texas MD Anderson Cancer Center, Houston, TX, United States. Electronic address: sbcantor@mdanderson.org.
authors.forename: Scott B
authors.initials: SB
authors.lastname: Cantor
mesh_terms: D000328:Adult; D001005:Anus Neoplasms / Q000517:prevention & control*; D002278:Carcinoma in Situ / Q000517:prevention & control*; D015331:Cohort Studies; D003362:Cost-Benefit Analysis; D018451:Homosexuality, Male; D000068857:Human Papillomavirus Recombinant Vaccine Quadrivalent, Types 6, 11, 16, 18; D006801:Humans; D008297:Male; D008875:Middle Aged; D030361:Papillomavirus Infections / Q000517:prevention & control*; D053918:Papillomavirus Vaccines / Q000008:administration & dosage*; D012008:Recurrence; D016896:Treatment Outcome; D014611:Vaccination / Q000191:economics* / Q000706:statistics & numerical data*
chemical_list: D000068857:Human Papillomavirus Recombinant Vaccine Quadrivalent, Types 6, 11, 16, 18; D053918:Papillomavirus Vaccines
keywords: Anal neoplasia; Cost-effectiveness analysis; High-grade intraepithelial neoplasia; Human papillomavirus; Quadrivalent human papillomavirus vaccine; Secondary/adjunct prevention