Economic burden associated with adverse events of special interest in patients with relapsed Philadelphia chromosome-negative B-cell acute lymphoblastic leukemia in the United States

ABSTRACTBackground: Infections, cytopenia, and gastrointestinal (GI) toxicity are adverse events of special interest (AESI) affecting most relapsed Philadelphia chromosome–negative (Ph−) B-cell acute lymphocytic leukemia (ALL) patients. This study quantified real-world rates and economic burden of these events among relapsed Ph− B-cell ALL patients in the United States.Methods: Adults with relapsed Ph− B-cell ALL during 1 April 2009–31 October 2016 were selected from MarketScan® healthcare claims databases. Outcomes included proportions of patients with AESIs and AESI-related costs during 100 days after relapsed hospitalization.Results: Of 400 relapsed Ph− B-cell ALL patients, 92.5% experienced ≥1 AESI during the median 100-day follow-up, of which 64.6% had infections, 94.6% cytopenia, and 46.2% GI toxicities. Mean (SD; median) AESI-related total cost per patient during follow-up was $197,213 ($308,551; $105,731), with a mean of 2 AESI-related hospitalizations comprising 32.2 inpatient days. Mean (SD; med...