180PDImpact of chemotherapy-induced ovarian failure (CIOF) on disease-free survival (DFS) and overall survival (OS) in young women with early breast cancer (EBC)

Abstract Background Previous data has shown that chemotherapy (CT)-induced amenorrhea was associated with a better DFS and OS in premenopausal patients with EBC, regardless of the hormone-receptor status (Swain et al. NEJM 2010 ). Methods 740 patients (pts) aged ≤45yrs treated with anthracycline/taxane-based CT for EBC from 4 German neo-/adjuvant trials were included. Centrally assessed estradiol and follicle-stimulating hormone (FSH) in paired blood samples collected at baseline and 4 weeks after the last therapy infusion were considered. CIOF was defined as estradiol 12.4IU/l after CT for those pts with premenopausal hormone levels at baseline. 4-year DFS and OS (rate, hazard ratio (HR) and 95% confidence interval (CI)) overall and in subgroups by hormone-receptor status (positive, negative) and age (≤30, 31-35, 36-40, >40yrs) are presented. Results Median follow-up was 49.6 (range 48.8-50.3) months. 4-year DFS and OS rates as well as HR overall and in subgroups are presented in the Table below. Pts with CIOF had a better DFS compared to pts without CIOF (HR=0.47, 95%CI 0.31-0.71). The DFS advantage was significant in pts with hormone-receptor positive (HR=0.38, 95%CI 0.22-0.64) EBC. A trend towards a better OS was observed only for pts with hormone-receptor positive EBC (HR=0.45, 95%CI 0.19-1.05). Within age groups, CIOF showed a statistically significant improvement in DFS only in women ≤30yrs (HR=0.21, 95%CI 0.05-0.97). No statistically significant OS benefit was observed in any of the age groups. Only pts >40yrs showed a trend towards a better OS (HR=0.35, 95%CI 0.11-1.16).Table180PDTableDFSOS4-year ratelog rank p-valueHR [95% CI]4-year ratelog rank p-valueHR [95% CI]CIOFno CIOFCIOFno CIOFoverall (n=740)84.465.0 40 (n=373)85.765.00.2070.53 [0.19-1.45]92.481.30.0720.35 [0.11-1.16] Conclusions Pts with CIOF after anthracycline/taxane-based CT for EBC show a better DFS, especially in women with hormone-receptor positive EBC or younger than 30 years. The improvement in DFS translates in a survival advantage in pts with hormone-receptor positive EBC. Legal entity responsible for the study German Breast Group (GBG). Funding The study was supported by Walter Schulz Stiftung. Disclosure A. Schneeweiss: Honoraria (self), Research grant / Funding (institution), Travel / Accommodation / Expenses: Celgene; Honoraria (self), Research grant / Funding (institution), Travel / Accommodation / Expenses: Roche; Research grant / Funding (institution): AbbVie; Research grant / Funding (institution): Molecular Partner; Honoraria (self), Speaker Bureau / Expert testimony: AstraZeneca; Honoraria (self): Pfizer; Honoraria (self): Novartis; Honoraria (self): MSD Oncology; Honoraria (self): Tesaro; Honoraria (self), Travel / Accommodation / Expenses: Lilly. C. Denkert: Shareholder / Stockholder / Stock options: Sividon Diagnostics; Honoraria (self): Teva; Honoraria (self): Novartis; Honoraria (self): Pfizer; Honoraria (self): Roche; Honoraria (self), Advisory / Consultancy: Amgen; Advisory / Consultancy: MSD Oncology; Advisory / Consultancy: Daiichi Sankyo; Licensing / Royalties: VMScope digital pathology software; Licensing / Royalties: Patent application: EP18209672 - cancer immunotherapy; Licensing / Royalties: Patent application EP20150702464 - therapy response; Licensing / Royalties: Patent application EP20150702464 - therapy response. M. Untch: Honoraria (institution), Non-remunerated activity/ies: Abbvie; Honoraria (institution), Non-remunerated activity/ies: Amgen GmbH; Honoraria (institution), Non-remunerated activity/ies: AstraZeneca; Honoraria (institution): BMS; Honoraria (institution), Non-remunerated activity/ies: Celgene GmbH; Honoraria (institution), Non-remunerated activity/ies: Daiji Sankyo; Honoraria (institution), Non-remunerated activity/ies: Eisai GmbH; Honoraria (institution), Non-remunerated activity/ies: Janssen Cilag; Honoraria (institution), Non-remunerated activity/ies: Lilly; Honoraria (institution), Non-remunerated activity/ies: MSD Merck; Honoraria (institution), Non-remunerated activity/ies: Mundipharma; Honoraria (institution), Non-remunerated activity/ies: Myriad Genetics; Honoraria (institution), Non-remunerated activity/ies: Odonate; Honoraria (institution), Non-remunerated activity/ies: Pfizer GmbH; Honoraria (institution): PUMA Biotechnology; Honoraria (institution), Non-remunerated activity/ies: Roche Pharma AG; Honoraria (institution), Non-remunerated activity/ies: Sanofi Aventis Deutschland GmbH; Honoraria (institution), Non-remunerated activity/ies: Sividon Diagnostics; Honoraria (institution), Non-remunerated activity/ies: TEVA Pharmaceuticals Ind Ltd; Honoraria (institution), Non-remunerated activity/ies: Novartis. P.A. Fasching: Honoraria (self), Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Biontech; Honoraria (self): Roche; Honoraria (self): Pfizer; Honoraria (self): Celgene; Honoraria (self): Daiichi-Sankyo; Honoraria (self): TEVA; Honoraria (self): AstraZeneca; Honoraria (self): Merck Sharp & Dohme; Honoraria (self): Myelo Therapeutics; Honoraria (self): Macrogenics; Honoraria (self): Eisai; Honoraria (self): PUMA; Research grant / Funding (institution): Cepheid. F. Marme: Honoraria (self): Roche; Honoraria (self): AstraZeneca; Honoraria (self): Pfizer; Honoraria (self): Tesaro; Honoraria (self): Novartis; Honoraria (self): Amgen; Honoraria (self): PharmaMar; Honoraria (self): GenomicHealth; Honoraria (self): CureVac; Honoraria (self): EISAI; Honoraria (self): Clovis; Honoraria (self): Celgene. M. van Mackelenbergh: Honoraria (self): AstraZeneca; Honoraria (self): Novartis; Honoraria (self): Amgen. V. Muller: Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony: Amgem; Honoraria (self), Speaker Bureau / Expert testimony: AstraZeneca; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony: Diichi-Sankyo; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony: Eisai; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (institution): Novartis; Honoraria (self), Speaker Bureau / Expert testimony: Pfizer; Honoraria (self), Advisory / Consultancy, Speaker Bureau / Expert testimony, Research grant / Funding (institution): Roche; Honoraria (self), Speaker Bureau / Expert testimony: Celgene; Honoraria (self), Speaker Bureau / Expert testimony: Teva; Honoraria (self), Speaker Bureau / Expert testimony: Janssen-Cilag; Honoraria (self), Advisory / Consultancy: Genomic Health; Honoraria (self), Advisory / Consultancy: Hexal; Honoraria (self), Advisory / Consultancy: Pierre Fabre; Honoraria (self), Advisory / Consultancy: MSD; Honoraria (self), Advisory / Consultancy: Lilly; Honoraria (self), Advisory / Consultancy: Tesaro; Honoraria (self), Advisory / Consultancy: Nektar; Research grant / Funding (institution): Seattle Genetics. S. Loibl: Research grant / Funding (institution): Roche; Research grant / Funding (institution): AbbVie; Research grant / Funding (institution): AstraZeneca; Research grant / Funding (institution): Celgene; Research grant / Funding (institution): Novartis; Research grant / Funding (institution): Pfizer; Research grant / Funding (institution): Roche; Research grant / Funding (institution): Seattle Genetics; Research grant / Funding (institution): Teva; Research grant / Funding (institution): Vifor; Research grant / Funding (institution): PRIME; Research grant / Funding (institution): Daiichi; Licensing / Royalties: EP14153692.0 pending. All other authors have declared no conflicts of interest.