Breast Cancer Research and Treatment

, Volume 159, Issue 2, pp 357–365

Adjuvant systemic therapy in early breast cancer: impact of guideline changes and clinicopathological factors associated with nonadherence at a nation-wide level

  • A. M. F. Verschoor
  • A. Kuijer
  • J. Verloop
  • C. H. Van Gils
  • G. S. Sonke
  • A. Jager
  • T. van Dalen
  • S. G. Elias
Epidemiology

DOI: 10.1007/s10549-016-3940-7

Cite this article as:
Verschoor, A.M.F., Kuijer, A., Verloop, J. et al. Breast Cancer Res Treat (2016) 159: 357. doi:10.1007/s10549-016-3940-7
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Abstract

Over recent years, adjuvant systemic treatment guidelines (AST) for early-stage breast cancer have changed considerably. We aimed to assess the impact of these guideline changes on the administration of AST in early-stage breast cancer patients and to what extent these guidelines are adhered to at a nation-wide level. We used Netherlands Cancer Registry data to describe trends in AST prescription, adherence to AST guidelines, and to identify clinicopathological determinants of nonadherence. Between 1990 and 2012, 231,648 Dutch patients were diagnosed with early breast cancer, of whom 124,472 received AST. Adjuvant endocrine treatment (ET) use increased from 23 % of patients (1990) to 56 % (2012), and chemotherapy from 11 to 44 %. In 2009–2012, 8 % of patients received ET and 3 % received chemotherapy without guideline indication. Conversely, 10–29 % of patients did not receive ET and chemotherapy, respectively, despite a guideline indication. Unfavorable clinicopathological characteristics generally decreased the chance of undertreatment and increased the chance for overtreatment. Remarkable was the increased chance of ET undertreatment in younger women (RR < 35 vs 60–69 years 1.79; 95 % CI 1.30–2.47) and in women with HER2+ disease (RR 1.64; 95 % CI 1.46–1.85). Over the years, AST guidelines expanded resulting in much more Dutch early breast cancer patients receiving AST. In the majority of cases, AST administration was guideline concordant, but the high frequency of chemotherapy undertreatment in some subgroups suggests limited AST guideline support in these patients.

Keywords

Breast cancer Adjuvant systemic therapy Chemotherapy Endocrine therapy Guideline adherence Overtreatment Undertreatment 

Supplementary material

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Supplementary material 1 (DOC 1322 kb)
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Supplementary material 2 (JPEG 379 kb)

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Epidemiology, Julius Center for Health Sciences and Primary CareUniversity Medical Centre UtrechtUtrechtThe Netherlands
  2. 2.Department of SurgeryDiakonessenhuis UtrechtUtrechtThe Netherlands
  3. 3.Department of RadiologyUniversity Medical Center UtrechtUtrechtThe Netherlands
  4. 4.Department of ResearchNetherlands Comprehensive Cancer OrganizationUtrechtThe Netherlands
  5. 5.Department of Medical OncologyNetherlands Cancer InstituteAmsterdamThe Netherlands
  6. 6.Department of Medical OncologyErasmus Medical Cancer InstituteRotterdamThe Netherlands