• Sun-Kyeong Park, Jae-A Park, So-Young Yang, Ju-Young Shin, and Hyein Koh.
• College of Pharmacy, The Catholic University of Korea, Bucheon, Korea.
• Curr Med Res Opin. 2020 Nov 1; 36 (11): 1825-1833.

ObjectivesRecognizing the value of anticancer treatments based on progression-free survival and overall survival may help decision making in healthcare policy. We aimed to measure and compare the impact of disease progression and terminal state prior to death on healthcare costs in HR+, HER2- ABC patients.MethodsWe conducted a retrospective study using Korean nationwide health insurance claims database between 1 September 2012 and 31 August 2017. The impact of disease progression was estimated by measuring the average incremental monthly cost per patient during 1 year after progression compared to 1 year before progression. Death-related costs per patient per month (PPPM) were measured for those who died within 1 year after progression. Generalized estimating equation (GEE) was used to estimate the variations in PPPM costs by progression and death with adjustment for clinical factors.ResultsAfter progression, 1,636 patients expensed $2,892 per month more on average than before progression ($3762 vs. $870). The GEE analysis with adjustment for baseline characteristics showed that PPPM costs increased by 3.46 folds (95% CI = 3.06-3.93) after progression. Also, PPPM costs were 1.74 (95%CI = 1.43-2.12) times higher in patients who died within 1 year after progression relative to survived patients. When considering the interaction between progression and death, deceased patients showed higher increased ratio of PPPM costs after progression (4.91; p=value<.0001) than survived patients (2.95; 95% CI = 2.61-3.34).ConclusionsFrom the payer's perspective, more healthcare costs incurred during the progression state than terminal state in HR+, HER2- ABC patients. The impact of disease progression emphasizes the importance of effectively treating HR+, HER2- ABC patients.

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