Real-world healthcare resource utilization and costs among relapsed/refractory (R/R) mantle cell lymphoma (MCL) patients receiving ibrutinib or chemoimmunotherapy (CIT)

e19408 Background: Ibrutinib is a targeted oral therapy indicated for MCL patients who received ≥1 prior line of therapy (LOT) (conditional approval on 11/13/2013 in the US). This study compared healthcare resource utilization (HRU) and costs of R/R MCL patients treated with ibrutinib ± rituximab (I±R) or CIT in a US-managed care population. Methods: Optum Clinformatics Extended DataMart De-Identified Databases (05/13/2013-6/30/2019) were used to identify adults with MCL receiving I±R or CIT (index date) following ≥1 prior LOT. Patients’ baseline characteristics were balanced using inverse probability of treatment weighting (IPTW). Monthly HRU and costs (plan paid amount) were evaluated during the first Oncology Care Model (OCM) episode (i.e., first 6 months) post-index and during the observed index I±R or CIT LOT (index LOT); and compared using rate ratios (RRs) and mean monthly cost differences (MMCDs), respectively. Results: A total of 146 I±R and 158 CIT patients were identified. Given the small sample size and to ensure outliers were not driving the results, 2 patients with total healthcare costs ≤0.5th and ≥99.5th percentile were excluded from each cohort. After IPTW, 149 and 151 patients were included in the weighted I±R and CIT cohorts, respectively (mean length of index LOT: 12.0 vs 11.0 months). During the first OCM episode and during the index LOT, the I±R cohort had significantly fewer monthly days with outpatient services compared to the CIT cohort (OCM: RR= 0.63, P