How patients experience endocrine therapy for breast cancer: an online survey of side effects, adherence, and medical team support.

Purpose: Many patients with hormone receptor-positive (HR+) breast cancer do not adhere to endocrine therapy (ET), and treatment-related side effects are often discussed by participants in online breast cancer forums. Our aim was to survey this unique group of patients about their ET-related experiences.

Methods: We partnered with patients active in breast cancer social media communities to develop a survey assessing ET-related side effects and medical team communication.