Abstract A052: Lifetime cost of care associated with squamous cell carcinoma of the anus in Puerto Rico
Authors: Ortiz-Ortiz Karen J. , Gierbolini-Bermúdez Axel , Ortiz Ana P. , Pabón-Cruz Karen , Wu Chi-Fang , Ramos-Cartagena Jeslie , Morales-Martínez Reydi , Deshmukh Ashish A. 
Published: January 2023

Abstract
Background: Squamous cell carcinoma of the anus (SCCA), caused by human papillomavirus infection (HPV), is the most frequently diagnosed form of anal cancer (85%-90%). SCCA incidence has increased dramatically among the general population in Puerto Rico (nearly 5% annually) and the risk is disproportionately elevated among patients living with HIV. SCCA is preventable through HPV vaccination and screening. Therefore, the study of the cost of anal cancer care could have significant implications for understanding preventable economic burden in Puerto Rico. Objective: Determine the lifetime and phase-specific cost of SCCA cases aged ≥21 diagnosed during 2009-2016 in Puerto Rico. Method: This population-based study used the Puerto Rico Central Cancer Registry-Health Insurance Linkage Database (PRCCR-HILD), which links PRCCR data with health insurance claim data from the principal health insurance companies and the government health plan. PRCCR-HILD has information for almost 90% of Puerto Rico's cancer cases from 2008. We matched SCCA cases and non-cancer control (1:1) by age and sex for each phase of care (initial, continuation, and terminal). SCCA-related costs were calculated by subtracting the costs between SCCA patients and the control group. We used the phase-specific monthly cost estimates combined with survival data, stratified by age and cancer stage (localized, regional, and distance), to calculate the lifetime and average annual cost (discount at 3%) for SCCA. The cost was adjusted to 2019 US dollars using the consumer price index. We used the number of SCCA incident cases for 2019, stratified by age group and multiplied by the lifetime SCCA cost estimates, to calculate the SCCA-related lifetime economic burden for Puerto Rico. Results: Of the 351 patients with SCCA included in this study, the mean age at diagnosis was 64 years, 66.4% were women, 57.6% were diagnosed at a localized stage, and 23.1% were enrolled in private insurance. The overall survival after cancer diagnosis was 18 years. Meanwhile, the average monthly costs per patient were higher in the initial phase ($4,755), followed by the terminal phase ($3,499). The main cost driver in all phases was the outpatient costs. However, inpatient costs increased substantially at the terminal phase of care. The average lifetime cost for patient with SCCA was $137,343 (95% CI: $130,873-$145,241) (2019 US dollars). The average SCCA per year cost was $9,193 (95% CI: $8,744-$9,895), while the SCCA-related lifetime economic burden for 2018 in Puerto Rico was nearly $8.7 million. Conclusion: To our knowledge, this is the first study to describe the cost of SCCA management in Puerto Rico. Although SCCA continues to be relatively rare among the general population, our study shows that the SCCA-related lifetime economic burden is substantial and could continue to rise due to the rising SCCA burden in Puerto Rico. These findings could support the evaluation of the impact of strategies to reduce the SCCA burden through HPV vaccination and anal cancer screening for high-risk populations.
Citation Format: Karen J. Ortiz-Ortiz, Axel Gierbolini-Bermúdez, Ana P. Ortiz, Karen Pabón-Cruz, Chi-Fang Wu, Jeslie Ramos-Cartagena, Reydi Morales-Martínez, Ashish A. Deshmukh. Lifetime cost of care associated with squamous cell carcinoma of the anus in Puerto Rico [abstract]. In: Proceedings of the 15th AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2022 Sep 16-19; Philadelphia, PA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2022;31(1 Suppl):Abstract nr A052.