Game-Based app aims to boost HPV vaccination in young cancer survivors

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Current patient in the University of Minnesota CCSP clinic or the Children's Minnesota Long-Term Follow-up (LTFU) Program clinic. * Patients seen in the CCSP clinic who do not have a history of cancer but who have received immunosuppressive therapy or HSCT for treatment of a hematologic disorder. * Survivor of childhood cancer (defined as diagnosed with cancer at age 25 years or younger) who is currently 18-26 years of age OR a caregiver of a survivor of childhood cancer who is currently 9-17 years of age. * 6+ months post-treatment; current treatment for graft-versus-host disease allowed * No previous HPV vaccination or incomplete HPV vaccination (defined as \<3 doses post-cancer therapy). Individuals who are unsure of their HPV vaccination status who are unable to find vaccination records per the procedures detailed in Section 5.2, EHR support will be eligible, in concordance with real-world clinical practice regarding HPV vaccination. Exclusion Criteria: * Previous completion of the HPV vaccination series. Those who are eligible for re-vaccination per the CDC guidelines will be encouraged by their oncologist to re-vaccinate, but will not be included in the QI study or RCT. * Unable to read/write in English per self-report (only applies to participants in the RCT \[Aim 2\]). * Pregnant at the time of enrollment or plans to become pregnant in the next year. Pregnancy test at the time of enrollment is not required if pregnancy not clinically suspected in concordance with clinical guidelines for HPV vaccine administration. * Currently receiving treatment for cancer or hematologic disorder or plan for treatment within 12 months of enrollment; treatment for graft-versus-host disease allowed. * Other contraindications to the HPV vaccine (e.g. history of immediate hypersensitivity reaction to any vaccine component, including yeast).