Key clinical point: Adjuvant endocrine therapy (ET) for 2 years showed a long-term (20 years) advantage in premenopausal women with estrogen receptor-positive (ER+) breast cancer (BC), with differential treatment benefit observed in genomic high-risk vs low-risk tumors.
Major finding: Goserelin (hazard ratio [HR] 0.49; 95% CI 0.32-0.75), tamoxifen (HR 0.57; 95% CI 0.38-0.87), and combined goserelin-tamoxifen (HR 0.63; 95% CI 0.42-0.94) vs no adjuvant ET improved long-term distant recurrence-free interval in the overall cohort of patients, with tamoxifen and goserelin benefitting genomic low-risk (HR 0.24; 95% CI 0.10-0.60) and high-risk (HR 0.24; 95% CI 0.10-0.54) patients, respectively.
Study details : Findings are from the secondary analysis of the Stockholm trial including 584 premenopausal patients with ER+ BC who were randomly assigned to receive goserelin, tamoxifen, combined goserelin-tamoxifen, or no adjuvant ET for 2 years.
Disclosures: This study was supported by the Swedish Research Council and other sources. Some authors declared serving as consultants or advisors or leaders for, being employees or stockowners of, or receiving research funding, honoraria, travel, or accommodation expense from several sources.
Source: Johansson A et al. Twenty-year benefit from adjuvant goserelin and tamoxifen in premenopausal patients with breast cancer in a controlled randomized clinical trial. J Clin Oncol. 2022 (Jul 21). Doi: 10.1200/JCO.21.02844