San Antonio Breast Cancer Symposium

Higher Oncotype DX recurrence scores were associated with prolonged persistence to 5 years of endocrine therapy vs lower Oncotype DX recurrence scores in patients with low-risk, estrogen receptor-positive/progesterone receptor–positive breast cancer, according to findings from a retrospective review.

Aileen I. Fernandez, PhD, discusses the results of a study examining low HER2 expression in breast cancer.

Datopotamab deruxtecan showed highly encouraging and durable efficacy through overall response rates in patients with advanced or metastatic triple-negative breast cancer.

The combination of entinostat and exemestane led to a significant improvement in progression-free survival compared with placebo and exemestane in Chinese patients with advanced hormone receptor–positive breast cancer.

Neoadjuvant pembrolizumab plus chemotherapy followed by adjuvant pembrolizumab resulted in a statistically significant and clinically meaningful improvement in event-free survival in patients with early-stage triple negative breast cancer.

Adding adjuvant palbociclib to standard endocrine therapy did not improve outcomes in patients with stage II to III hormone receptor–positive, HER2-negative early breast cancer.

Pembrolizumab plus chemotherapy demonstrated a statistically significant and clinically meaningful improvement in both progression-free survival and overall survival vs chemotherapy alone in patients with previously untreated, locally recurrent, inoperable, or metastatic triple-negative breast cancer who have a PD-L1 combined positive score of 10 or higher.

Metformin failed to improve invasive disease-free survival or overall survival when used as adjuvant treatment in patients with early breast cancer, irrespective of estrogen or progesterone receptor status.

Patients with primary breast cancer who developed secondary uterine cancer following treatment with tamoxifen may have had disease driven by PI3K-pathway activation.

The selective estrogen receptor degrader elacestrant (RAD1901) led to a 30% reduction in the risk of disease progression or death compared with standard of care in patients with estrogen receptor–positive, HER2-negative metastatic breast cancer who previously received CDK4/6 inhibition.

Genomic alterations identified through multigene sequencing, classified in the I/II tiers of the ESMO Scale of Actionability of Molecular Targets, and paired with matching targeted therapy led to a significant improvement in progression-free survival vs maintenance chemotherapy in patients with HER2-negative metastatic breast cancer.

Imaging mass cytometry at the single-cell level showed potential as an immunotherapy response prediction tool in early triple-negative breast cancer.

December 14, 2020 - The combination of neratinib and capecitabine showed a 34% reduction in the risk of disease progression or death compared with lapatinib and capecitabine in patients with HER2-positive breast cancer who had central nervous system metastases at baseline.

Erika P. Hamilton, MD, discusses the mechanism of action of OP-1250 in patients with hormone receptor–positive, HER2-negative metastatic breast cancer.

Nadia Harbeck, MD, PhD, discusses Ki-67 as a biomarker for identifying patients with high-risk early breast cancer who received treatment on the monarchE trial.

December 11, 2020 - Tucatinib in combination with trastuzumab and capecitabine significantly prolonged the time to deterioration of health-related quality of life in patients with HER2- positive metastatic breast cancer with brain metastases.

December 11, 2020 - The addition of 1 year of palbociclib to endocrine therapy failed to improve invasive disease-free survival in patients with hormone receptor–positive, HER2-negative breast cancer who are at high risk of relapse following neoadjuvant chemotherapy.

The clinical tool RSClin™, which integrates the 21-gene expression assay and clinical pathologic features, was shown to provide more prognostic information than the 21-gene recurrence score or clinical pathologic features alone and a more precise prediction of absolute chemotherapy benefit in node-negative early breast cancer.

December 11, 2020 - Gastrointestinal adverse events that occurred in patients with metastatic breast cancer who were treated with oral paclitaxel and encequidar can be managed by the use of 5- HT3 inhibitors and early intervention with loperamide.

December 11, 2020 - Sacituzumab govitecan increased response rates and improved progression-free survival vs chemotherapy in patients with metastatic triple-negative breast cancer with stable brain metastases, although no overall survival improvement was observed.

December 11, 2020 - The presence of circulating tumor DNA following neoadjuvant chemotherapy with or without pembrolizumab was a biomarker for response and distant recurrence-free survival in patients with high-risk early-stage breast cancer.

December 11, 2020 - Patients with human epidermal growth factor receptor 2-negative, hormone receptor-positive metastatic breast cancer who were treated with tesetaxel and a reduced dose of capecitabine experienced improvements in progression-free survival compared with those treated with the FDA-approved dose of capecitabine alone.

December 11, 2020 - The combination of plinabulin and pegfilgrastim was 53% more effective in reducing the incidence of profound neutropenia compared with pegfilgrastim alone in patients undergoing chemotherapy, according to full findings of the phase 3 PROTECTIVE-2 trial.

December 11, 2020 - Use of a novel HER2 quantitative continuous score was better able to provide an objective and quantitative assessment of HER2 expression to identify patients who are most likely to respond to fam-trastuzumab deruxtecan-nxki.

December 10, 2020 - The GP2 immunotherapy plus granulocyte-macrophage colony-stimulating factor demonstrated potent responses and a 100% disease-free survival in patients with HER2/neu 3–positive disease who received adjuvant trastuzumab.

December 10, 2020 - Amcenestrant elicited antitumor activity in heavily pretreated, postmenopausal women with advanced or metastatic estrogen receptor–positive breast cancer.

December 10, 2020 - The addition of neoadjuvant atezolizumab to nab-paclitaxel followed by doxorubicin plus cyclophosphamide was found to improve pathologic complete responses compared with placebo plus chemotherapy in patients with early triple-negative breast cancer without adding additional treatment burden to patients.

Sara M. Tolaney, MD, MPH, discusses the safety profile of SAR439859 in estrogen receptor–positive, HER2-negative metastatic breast cancer.