Providing specific definitions for compliance and persistence is important for sound quantitative expressions of patients' drug dosing histories and their explanatory power for clinical and economic events. Adoption of these definitions by health outcomes researchers will provide a consistent framework and lexicon for research.

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Background-Data regarding the health care costs of inflammatory bowel disease (IBD) in the United States are limited.

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A cost-effectiveness analysis of proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors based on their lowering of low-density lipoprotein cholesterol (LDL-C) demonstrated that the 2015 price of PCSK9 inhibitors would need to be reduced by more than two-thirds (to $4536 per year) to meet generally accepted cost-effectiveness thresholds. 1 Since that report, the Further Cardiovascular Outcomes Research With PCSK9 Inhibition in Subjects With Elevated Risk (FOURIER) trial found the PCSK9 inhibitor evolocumab reduced risk of major adverse cardiovascular events (MACE; myocardial infarction, stroke, or cardiovascular death). 2 This study assessed how the cost-effectiveness of PCSK9 inhibitors is altered by the FOURIER results and current prices.