Trial reportAnnals of oncology : official journal of the European Society for Medical Oncology2026
Ovarian reserve as a measure of adjuvant chemotherapy benefit in hormone receptor positive (HR-positive), HER2-negative, node-positive breast cancer in SWOG S1007 (RxPONDER).
Trial report in Annals of oncology : official journal of the European Society for Medical Oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundThe phase 3 RxPONDER trial compared endocrine therapy (ET) alone or with chemotherapy (CET) in patients with hormone receptor-positive/human epidermal growth factor receptor 2-negative breast cancer with recurrence score (RS) ≤25. CET benefit for the primary outcome, invasive disease-free survival (IDFS), was limited to premenopausal women who largely did not receive ovarian function suppression. In this study, we assessed hormones associated with ovarian reserve to further refine the prediction of CET benefit. PATIENTS AND
methodsPretreatment serum estradiol, progesterone, follicule-stimulating hormone (FSH), luteinizing hormone (LH), anti-Müllerian hormone (AMH), and inhibin B (INHB) were assessed in a blinded fashion from 1556 participants aged <55 years. All markers used a predefined cut point. Associations with markers and IDFS and distant relapse-free survival (DRFS) were evaluated for prediction of CET benefit, adjusting for RS. Cox regression analyses of assigned treatment and its interaction with potential markers were adjusted for multiplicity.
resultsBaseline estradiol, progesterone, LH, and FSH were not predictive for CET benefit. AMH ≥10 pg/ml showed significant interaction with chemotherapy benefit for IDFS (P
conclusionAmong premenopausal patients aged <55 years, participants with baseline AMH <10 pg/ml did not benefit from CET. AMH was a significantly better indicator of CET benefit than menopause status, age, or other hormones. Measures of ovarian reserve may refine the selection of patients for CET.
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