HPV Vaccination Initiation and Completion Among Pediatric, Adolescent, and Young Adult Cancer Survivors and a Comparison Population Sample Receiving Primary Care.

Human papillomavirus (HPV) vaccinations can reduce pediatric, adolescent, and young adult (PAYA) cancer survivors' susceptibility to HPV-related subsequent cancers. We examined differences in HPV vaccination initiation and completion among a Utah-based cohort of PAYA cancer survivors and a cancer-free population sample. Participants received primary care at 1 of 2 health care systems during study follow-up: 2006-2016. Vaccination records were identified from these health care systems, statewide vaccination records, and an all-payer claims database. HPV vaccination initiation (1 dose) and completion (3 doses) were compared between cancer survivors (N=1579) and age-matched and sex-matched cancer-free population sample (N=4513). Individuals were 9 to 21 years old at cohort entry. Mixed-effects Poisson regression estimated incidence rate ratios (IRRs) and 95% confidence intervals (CIs). Relative to the population sample, cancer survivors were less likely to initiate vaccination (IRR=0.8, 95% CI: 0.73-0.98). The most severe disparity compared with the population sample for vaccine initiation (IRR=0.5, 95% CI: 0.31-0.74) or completion (IRR=0.5, 95% CI: 0.28-0.89) was observed for Hispanic survivors. PAYA cancer survivors are less likely to initiate HPV vaccination series than noncancer counterparts. Targeted interventions should be directed at PAYA survivors to raise HPV vaccination with emphasis on high-risk groups such as Hispanic survivors.