Real-World Treatment Patterns, Adverse Events, Resource Use, and Costs Among Commercially Insured, Younger Patients with Chronic Lymphocytic Leukemia in the USA: A Retrospective Cohort Study.

INTRODUCTION: Amidst a changing treatment landscape, real-world evidence on the burden of chronic lymphocytic leukemia (CLL) is limited. The purpose of this study was to describe treatment patterns, adverse events (AEs), and economic burden among treated patients with CCL. METHODS: A retrospective cohort study was conducted with IQVIA PharMetrics® Plus. Patients at least 18 years old with CLL treatment between November 1, 2013 and May 31, 2018 were identified; index date was first observed CLL treatment. Patients had at least one CLL diagnosis pre-index and a second diagnosis anytime during the study period, at least 1-year pre- and at least 30-day post-index continuous enrollment and no pre-index CLL treatment. Analyses focused on patients receiving one of the four most common regimens observed. Outcomes included treatment patterns, frequency of incident AEs, and healthcare resource use and costs. Multivariable logistic regression and generalized linear modelling were used to evaluate risk of hospitalization and all-cause costs per patient per month (PPPM). RESULTS: A total of 1706 patients were included in the study (median [interquartile range] age 58 [55-62] years, 66% male, median Charlson Comorbidity Index 2 [2-3], median follow-up 16 [8-28] months). Common regimens, irrespective of treatment line, were bendamustine-rituximab (B-R, 27%), ibrutinib monotherapy (I, 27%), rituximab monotherapy (R, 19%), and fludarabine combined with cyclophosphamide and rituximab (FCR, 16%); 59% had at least one incident AE (B-R, 62%; I, 60%; R, 25%; FCR, 79%). Mean total all-cause healthcare cost over follow-up was $13,858 ± 14,626 PPPM. Increased number of AEs was associated with increased odds of hospitalization (odds ratio = 2.9; 95% confidence interval [CI] 2.5-3.4) and increased mean cost PPPM (cost ratio = 1.2; 95% CI 1.1-1.2). CONCLUSION: This study highlights the treatment toxicity and associated economic burden among patients with CCL in the USA. As novel therapies are increasingly used, further research examining outcomes will inform the risks, benefits, and value of novel agents to prescribers and patients.