Abstract
Purpose
Aromatase inhibitors are the most commonly prescribed adjuvant endocrine therapy for hormone-dependent early breast cancer in postmenopausal women. Among Canadian Cancer Trials Group MA.27 participants, anastrozole and exemestane had comparable 5-year event-free survival. This companion study examined differences in patient-reported treatment-related symptoms (TRS) and health-related quality of life (HRQL) among postmenopausal women randomized to anastrozole or exemestane.
Methods
MA.27 participants (N = 686, of 7576) randomized to 5 years of anastrozole (1 mg/day, n = 371, Arm A) or exemestane (25 mg/day, n = 315, Arm E) completed the 56-item Functional Assessment of Cancer Therapy-Endocrine Symptoms (FACT-ES) questionnaire to assess TRS and HRQL. The FACT-ES was completed at baseline, 3, 6, 12, and 24 months.
Results
No significant differences in FACT-ES median scores measuring TRS and HRQL were observed between treatment arms at any time point. Change in TRS from baseline was statistically significant at 3, 6, 12, and 24 months. HRQL was stable over time in both arms. Greater TRS burden was associated with poorer HRQL (coefficient = 0.57, p < 0.001). Twenty percent of patients discontinued AI therapy by month 24 and 32% discontinued AIs at 4 years. In both arms, patients reporting more side effect bother prior to initiating study treatment had a higher risk of discontinuing treatment before completing protocol therapy (hazard ratio [HR] 1.29, 95% CI 1.08–1.55, p = 0.01).
Conclusions
TRS and HRQL were comparable between anastrozole and exemestane. TRS negatively affect HRQL. Women who report being bothered by treatment side effects prior to initiating an AI are at increased risk for early treatment discontinuation.
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Abbreviations
- CCTG:
-
Canadian Clinical Trials Group
- ECOG:
-
Eastern Cooperative Oncology Group
- ACRIN:
-
American College of Radiology Imaging Network
- TRS:
-
Treatment-related symptoms
- HRQL:
-
Health-related quality of life
- FACT-ES:
-
Functional Assessment of Cancer Therapy-Endocrine Symptoms
- PRO:
-
Patient-reported outcomes
- AIs:
-
Aromatase inhibitors
- Arm A:
-
Anastrozole
- Arm E:
-
Exemestane
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Acknowledgements
This study was coordinated by the ECOG-ACRIN Cancer Research Group (Robert L. Comis, MD and Mitchell D. Schnall, MD, PhD, Group Co-Chairs) and supported by the National Cancer Institute of the National Institutes of Health under the following Award Numbers: CA189828, CA180867, CA189808, CA189954, CA180799, CA189822, CA189863, CA189860, CA189812, CA180816, CA180795, CA180863, Canadian Cancer Society Research Institute Grants #021039 and #704970 and by the AVON Breast Cancer Crusade ABCC. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. government.
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Wagner, L.I., Zhao, F., Goss, P.E. et al. Patient-reported predictors of early treatment discontinuation: treatment-related symptoms and health-related quality of life among postmenopausal women with primary breast cancer randomized to anastrozole or exemestane on NCIC Clinical Trials Group (CCTG) MA.27 (E1Z03). Breast Cancer Res Treat 169, 537–548 (2018). https://doi.org/10.1007/s10549-018-4713-2
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DOI: https://doi.org/10.1007/s10549-018-4713-2