ENRICH: Validating a multidimensional patient-reported financial toxicity measure.

Abstract

153 Background: Financial toxicity is a patient-reported outcome reflecting burdens of cancer treatment costs. There is a need to assess financial toxicity in cancer care, as its unique domains—upstream factors like direct medical costs or downstream economic impact like bankruptcy—predict worse QOL, adherence, and mortality. Socioeconomically disadvantaged patients bear disparate financial toxicity burdens. We thus developed and report performance of a new measure, the Economic StraiN and Resilience in Cancer (ENRICh), to assess all financial toxicity domains in economically diverse patients. Methods: We studied 238 patients with Stage I-IV cancer from a tertiary academic comprehensive cancer center (MDA) and county safety-net hospital serving socioeconomically disadvantaged patients (LBJ). Financial toxicity domains and corresponding subscales were developed from qualitative/cognitive (n = 104) interviews. ENRICh and Comprehensive Score for Financial Toxicity (COST) questions were administered (n = 127; MDA = 71, LBJ = 56). To demonstrate known-group validity, we compared ENRICh scores between centers; for concurrent validity, we correlated ENRICh and COST; for reliability, we calculated Cronbach's coefficient α for ENRICh subscales (range 0, none, to 10, high burden). Results: There were 4 distinct, valid financial toxicity domains/subscales: 1) Burden of cost; 2) Disruption of financial stability; 3) Depletion of financial coping; 4) Depletion of instrumental coping. Patients from the 2 centers significantly differed in subscale and overall ENRICh scores. Socioeconomically disadvantaged patients had worse mean scores (4.9 vs 2.1, 95%CI -3.6,-2.1, effect size 1.4, P < .001). ENRICh significantly correlated with COST (r = -0.82, 95%CI -0.87,-0.77, P < .001). Subscales were reliable with excellent internal consistency (Cronbach α = 0.78 to 0.94). The 4 ENRICh domains collectively had synergistic impact on overall financial toxicity burden. Conclusions: ENRICh is valid, reliable, and identifies and 4 novel domains of financial toxicity. Future utility of this tool is to guide assessment/interventions targeting financial toxicity domains affecting diverse cancer patients, to mitigate disparities.