title: Erythropoiesis-Stimulating Agent (ESA) Practice Patterns in Patients With Chemotherapy-Induced Anemia (CIA) Treated at Hospital Oncology Clinics.
abstract: OBJECTIVE
  To characterize erythropoiesis-stimulating agent (ESA) usage initiated in hospital outpatient oncology centers that employ weekly (QW) and every-3-week (Q3W) ESA dosing regimens; describe the frequency of ESA dosing, transfusions, hemoglobin determinations, and anemia-related visits between these 2 regimens; and compare the rates at which inpatient ESA doses are administered on QW versus Q3W schedules.
  
  
  METHODS
  This was a retrospective, observational record review evaluating ESA usage in 641 patients from 8 outpatient oncology clinics throughout the United States. Adult patients who initiated myelosuppressive chemotherapy for a documented solid tumor between August 1, 2007 and June 30, 2009 and received their first 3 consecutive outpatient ESA doses on a QW or Q3W schedule were eligible for study inclusion. During a single course of chemotherapy, ESA administrations were recorded as long as ESA therapy was continued on the initial regimen. ESA doses were captured until termination of ESA therapy, until 9 months had elapsed since the first ESA dose, until the patient was switched to another ESA regimen, or until death. ESA administration during inpatient admissions was also recorded.
  
  
  RESULTS
  ESA utilization varied between the dosing groups, with fewer ESA doses administered per follow-up month in patients receiving Q3W versus QW ESA therapy (mean, 1 vs 2 doses). Compared to weekly administration, extended-dose ESA therapy also reduced the number of hemoglobin determinations and anemia-related visits without chemotherapy required per follow-up month. Neither the number of transfusions nor the number of packed red blood cell units administered per follow-up month differed between treatment groups. Compared to weekly ESA therapy, Q3W administration reduced costs associated with ESA prescribing and utilization.
  
  
  CONCLUSIONS
  Extended-dose ESA therapy (Q3W dosing) may improve practice efficiency and may be associated with reduced frequencies of hemoglobin determinations and ESA doses required. Q3W dosing may also reduce inpatient ESA utilization by reducing the number of ESA doses required for previously maintained outpatients.
authors.affiliation: RJM Group LLC, Crown Point, Indiana.
authors.forename: John F
authors.initials: JF
authors.lastname: Reitan
authors.affiliation: van Breda Research LLC, Bozeman, Montana.
authors.forename: Arletta
authors.initials: A
authors.lastname: van Breda
authors.affiliation: Amgen, Thousand Oaks, Califoria.
authors.forename: Sanatan
authors.initials: S
authors.lastname: Shreay
authors.affiliation: Amgen, Thousand Oaks, Califoria.
authors.forename: Patricia K
authors.initials: PK
authors.lastname: Corey-Lisle
authors.affiliation: Amgen, Thousand Oaks, Califoria.
authors.forename: Ze
authors.initials: Z
authors.lastname: Cong
keywords: ESA; anemia; erythropoiesis-stimulating agents; inpatient; outpatient