Abstract P5-15-18: Hemoglobin levels and quality of life in patients with breast cancer and symptomatic chemotherapy-induced anemia enrolled in the eAQUA study
Authors: Airoldi Mario , Spaeth Dominique , Van den Bosch Joan , Christofyllakis Charalambos , Belton Laura , Bohac Chet , Terwey Jan-Henrik , Tonini Giuseppe 
Published: May 2015

Background: Fatigue associated with chemotherapy-induced anemia (CIA) is common in patients with breast cancer, and can have adverse effects on quality of life (QoL). Erythropoiesis-stimulating agents (ESAs) reduce the need for transfusions and may improve QoL in patients with symptomatic CIA. Information on hemoglobin (Hb) levels and effects of fatigue on QoL in patients with breast cancer and CIA in real-world clinical practice is limited.

Methods: The Electronic Assessment of Quality of Life in Patients With Symptomatic CIA (eAQUA) study evaluated improvements in QoL for patients with CIA receiving ESAs who had an increase in Hb of ≥1 g/dL by week 9. This phase 4, international, longitudinal, prospective, observational study enrolled patients with solid tumors who received chemotherapy and had symptomatic anemia. Patients received ESA therapy for up to 13 weeks based on European indication. The primary outcome was the proportion of patients with increase in Hb ≥1 g/dL and improvement in fatigue-related QoL based on the Functional Assessment of Cancer Therapy-Fatigue (FACT-F; scale = 0 to 52 with lower scores indicating worse fatigue) subscale scores and fatigue Visual Analog Scale (VAS; scale = 0 to 100 with higher scores indicating worse fatigue) from baseline to week 9. FACT-F change scores were anchored to VAS change scores to determine the minimally important difference (MID) for improvements in QoL. Patients with a FACT-F change score that was ≥ the MID were considered to have an improvement in QoL. For Hb and QoL outcomes, week 9 data were those assessed closest to on-treatment day 57 (after initiation of ESA) and within on-treatment days 43 to 70 inclusive, to account for different ESA dosing schedules and the observational nature of the study. Secondary outcomes included rates of red blood cell (RBC) transfusions or iron supplementation during the study.

Results: Of 1262 patients enrolled in eAQUA, 289 had breast cancer and were included in the full analysis set (FAS; had at least one ESA dose); of these, 152 patients were eligible to be included in the primary analysis set (PAS; had QoL and Hb data available at baseline and week 9). At baseline, mean (standard deviation [SD]) Hb was 9.4 (0.6) g/dL; mean (SD) FACT-F and VAS scores were 27.1 (10.5) and 52.7 (22.8), respectively, in the FAS. Mean (SD) change from baseline at week 9 was 1.3 (1.3) g/dL for Hb; 4.1 (10.8) score change for FACT-F; and 4.7 (25.9) score change for VAS in the FAS. A total of 54 (18.7%) patients in the FAS required an RBC transfusion and 79 (27.3%) received iron supplementation. At week 9, 77 of 152 patients in the PAS had achieved improvement in fatigue-related QoL (50.7%; 95% confidence interval [CI] = 42.7%, 58.6%); 93 patients had increased Hb ≥1 g/dL (61.2%; 95% CI = 53.4%, 68.9%); and 59 patients (38.8%; 95% CI = 31.1%, 46.6%) had achieved both improvement in fatigue-related QoL and increased Hb ≥1 g/dL.

Conclusions: In this exploratory subgroup analysis, patients with breast cancer and symptomatic CIA treated with ESAs achieved clinically meaningful improvements in fatigue-related QoL and Hb levels.

Citation Format: Mario Airoldi, Dominique Spaeth, Joan Van den Bosch, Charalambos Christofyllakis, Laura Belton, Chet Bohac, Jan-Henrik Terwey, Giuseppe Tonini. Hemoglobin levels and quality of life in patients with breast cancer and symptomatic chemotherapy-induced anemia enrolled in the eAQUA study [abstract]. In: Proceedings of the Thirty-Seventh Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2014 Dec 9-13; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2015;75(9 Suppl):Abstract nr P5-15-18.