Key clinical point: Adjuvant endocrine therapy (ET) with an aromatase inhibitor (AI) was associated with better disease-free survival (DFS) than tamoxifen-only or tamoxifen+AI in patients with hormone receptor-positive (HR+)/ human epidermal growth factor receptor2-positive (HER2+) breast cancer (BC).
Major finding: Adjuvant ET with tamoxifen or tamoxifen+AI was associated with significantly worse DFS rates than AI in the entire population of women with HR+/HER2+ BC (hazard ratio 1.64; P = .025 ), with gonadotropin-releasing hormone being associated with improved DFS rates in premenopausal patients aged ≤45 years (hazard ratio 0.41; P = .023).
Study details: Findings are from a post hoc analysis of the ShortHER trial including 784 patients with HR+/HER2+ early BC who received adjuvant anthracycline/taxane-based chemotherapy plus trastuzumab.
Disclosures: This study was supported by Agenzia Italiana del Farmaco and other sources. Some authors declared receiving personal fees from several sources.
Source: Dieci MV et al. Type of adjuvant endocrine therapy and disease-free survival in patients with early HR-positive/HER2-positive BC: Analysis from the phase III randomized ShortHER trial. NPJ Breast Cancer. 2023;9(1):6 (Feb 4). Doi: 10.1038/s41523-023-00509-2