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Validation of a Novel Staging System for Disease-Specific Survival in Patients With Breast Cancer Treated With Neoadjuvant Chemotherapy

Validation of a Novel Staging System for Disease-Specific Survival in Patients With Breast Cancer... Purpose: We previously described a novel breast cancer staging system for assessing prognosis after neoadjuvant chemotherapy on the basis of pretreatment clinical stage (CS), estrogen receptor status (E), grade (G), and post-treatment pathologic stage (PS). This clinical-pathologic stage (CPS) + EG staging system assigned and summed points for each factor, allowing for better determination of breast cancer-specific survival than CS or PS alone. The current study was undertaken to validate this staging system using internal and external cohorts. Methods: We identified an internal cohort of 804 patients treated with neoadjuvant chemotherapy at our institution from 2003 to 2005 and an external cohort of 165 patients treated at another institution. Clinicopathologic characteristics, treatment regimens, and patient outcomes were assessed. Outcomes were stratified by CPS + EG score. Results: Five-year disease-specific survival (DSS) for the internal cohort was 77% (95% CI, 72 to 82) at a median follow-up of 3.4 years (range, 0.3 to 5.9 years). Five-year DSS for the external cohort was 86% (95% CI, 79 to 91) at a median follow-up of 4.7 years (range, 0.5 to 10.5 years). The ability of the CPS + EG score to stratify outcomes was confirmed in both the internal and external cohorts. Application of the CPS + EG staging system facilitated more refined categorization of patients into prognostic subgroups by outcome than presenting CS or final PS as defined by the American Joint Committee on Cancer (AJCC) staging system. Conclusion: The current study validates the CPS + EG staging system in two independent cohorts. We recommend that biologic markers and response to treatment be incorporated into revised versions of the AJCC staging system for patients receiving neoadjuvant chemotherapy. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Clinical Oncology Wolters Kluwer Health

Validation of a Novel Staging System for Disease-Specific Survival in Patients With Breast Cancer Treated With Neoadjuvant Chemotherapy

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References (23)

Publisher
Wolters Kluwer Health
Copyright
(C) 2011 American Society of Clinical Oncology
ISSN
0732-183X
eISSN
1527-7755
DOI
10.1200/JCO.2010.31.8469
Publisher site
See Article on Publisher Site

Abstract

Purpose: We previously described a novel breast cancer staging system for assessing prognosis after neoadjuvant chemotherapy on the basis of pretreatment clinical stage (CS), estrogen receptor status (E), grade (G), and post-treatment pathologic stage (PS). This clinical-pathologic stage (CPS) + EG staging system assigned and summed points for each factor, allowing for better determination of breast cancer-specific survival than CS or PS alone. The current study was undertaken to validate this staging system using internal and external cohorts. Methods: We identified an internal cohort of 804 patients treated with neoadjuvant chemotherapy at our institution from 2003 to 2005 and an external cohort of 165 patients treated at another institution. Clinicopathologic characteristics, treatment regimens, and patient outcomes were assessed. Outcomes were stratified by CPS + EG score. Results: Five-year disease-specific survival (DSS) for the internal cohort was 77% (95% CI, 72 to 82) at a median follow-up of 3.4 years (range, 0.3 to 5.9 years). Five-year DSS for the external cohort was 86% (95% CI, 79 to 91) at a median follow-up of 4.7 years (range, 0.5 to 10.5 years). The ability of the CPS + EG score to stratify outcomes was confirmed in both the internal and external cohorts. Application of the CPS + EG staging system facilitated more refined categorization of patients into prognostic subgroups by outcome than presenting CS or final PS as defined by the American Joint Committee on Cancer (AJCC) staging system. Conclusion: The current study validates the CPS + EG staging system in two independent cohorts. We recommend that biologic markers and response to treatment be incorporated into revised versions of the AJCC staging system for patients receiving neoadjuvant chemotherapy.

Journal

Journal of Clinical OncologyWolters Kluwer Health

Published: May 20, 2011

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