FITWISE: Feasibility Study of Tirzepatide for Weight Loss Intervention in Early-Stage Hormone Receptor Positive/HER2 Negative Breast Cancer
This clinical trial aims to evaluate the effectiveness of tirzepatide in achieving a 5% or more body weight reduction in patients undergoing adjuvant treatment for hormone receptor-positive, HER2-negative (HR+/Her2-) breast cancer. The study will also assess the safety and tolerability of tirzepatide, its feasibility based on discontinuation rates, and completion of treatment. Secondary objectives include evaluating 3-year invasive disease-free survival (IDFS) and distant relapse-free survival (DRFS), changes in BMI and body fat distribution, metabolic markers, and circulating tumor DNA (ctDNA).
• Consent: Be willing and able to provide written informed consent for the trial.
• Age: Male or Female patients aged 18 years or older.
• Breast Cancer Diagnosis: Have hormone receptor-positive (HR+), HER2-negative (HER2-) breast cancer previously diagnosed by biopsy. HR status is defined as estrogen receptor (ER) \>10% and/or progesterone receptor (PR) \>10%; HER2 status is defined as immunohistochemistry (IHC) 0 or 1+ or IHC 2+, fluorescence in situ hybridization (FISH) negative.
• Stage: Have previously untreated early-stage, clinical or anatomic stage I, II, or III hormone receptor-positive breast cancer.
• Definitive Treatment: Have had definitive treatment with curative intent for breast cancer, including surgery, chemotherapy, and radiotherapy as indicated.
• Body Mass Index (BMI): Have a BMI of 30 kg/m² or more, or a BMI of 27 kg/m² or more with one weight-related complication (e.g., hypertension, type 2 diabetes, dyslipidemia, obstructive sleep apnea, or cardiovascular disease).
• Performance Status: Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 2.
• Cardiac Function: Have a left ventricular ejection fraction (LVEF) of 50% or greater, or greater than the institution's lower limit of normal (LLN), as assessed by echocardiogram (ECHO) or multigated acquisition (MUGA) scan performed at screening.
• Organ Function: Demonstrate adequate organ function in screening labs.
• Tumor Specimens: Have archived biopsy or surgical tumor specimens available as tumor blocks or unstained slides.