Therapeutic Response

ER positive, HER2-negative, and PR positive status confers therapeutic sensitivity to Abemaciclib in combination with Tamoxifen in patients with Invasive Breast Carcinoma.

Statements

Source and description
Verzenio (abemaciclib) [product monograph]. HC. Health Canada approved abemaciclib in combination with endocrine therapy for the adjuvant treatment of adult patients with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2)-negative, node-positive, early breast cancer at high risk of disease recurrence based on clinicopathological features.
Verzenio (abemaciclib) [package insert]. FDA. The U.S. Food and Drug Administration (FDA) granted approval to abemaciclib in combination with endocrine therapy (tamoxifen or an aromatase inhibitor) for the adjuvant treatment of adult patients with hormone receptor (HR)-positive, human epidermal growth factor 2 (HER2)-negative, node positive, early breast cancer at high risk of recurrence. This indication is based on the monarchE (NCT03155997) clinical trial, which was a randomized (1:1), open-label, two cohort, multicenter study. Initial endocrine therapy received by patients included letrozole (39%), tamoxifen (31%), anastrozole (22%), or exemestane (8%).