A Window of Opportunity Study of Endocrine Therapy With and Without Prometrium in Postmenopausal Women With Early Stage Hormone Receptor-positive Breast Cancer.
A phase II randomised, open label study of pre-operative endocrine therapy with \& without prometrium in postmenopausal women with early stage breast hormone receptor positive (HR+) human epidermal receptor 2 negative (HER2-) breast cancer.
• Histologically confirmed ER+ and PR+ breast cancer (defined as ≥10% positive staining cells)
• Histologically confirmed HER2-negative breast cancer (defined as IHC 0-1 and/or FISH/CISH \<2.2)
• Tumour size ≥1 cm as measured by ultrasound and/or mammogram
• Ability to understand all patient information and informed-consent documents, written informed consent to participate in the trial, and to avail tissue and blood samples for research
• Aged 18 years or older