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for females ages 18 years and up
at San Francisco, California and other locations
study started
estimated completion:
Principal Investigator



The purpose of the study is to determine whether treatment with a PI3K inhibitor plus letrozole leads to an increase in pathologic clinical response and Objective Response Rate compared to treatment with placebo plus letrozole in patients with Breast cancer

Official Title

A Phase II Randomized, Double-blind Placebo Controlled, Study of Letrozole With or Without BYL719 or Buparlisib, for the Neoadjuvant Treatment of Postmenopausal Women With Hormone Receptor-positive HER2-negative Breast Cancer


Breast Cancer Breast Cancer, Pathological Complete Response, neoadjuvant, hormone receptor-positive Letrozole


You can join if…

Open to females ages 18 years and up

  1. Patient is an adult, female ≥ 18 years old at the time of informed consent
  2. Patient has a histologically and/or cytologically confirmed diagnosis of breast cancer
  3. Patient is postmenopausal.
  4. Patient has T1c-T3, any N, M0, operable breast cancer
  5. Patients must have measurable disease
  6. Patient has diagnostic biopsy available for the analysis of PIK3CA mutation and Ki67 level.
  7. Patient has estrogen-receptor and/or progesterone positive breast cancer as per local laboratory testing
  8. Patient has HER2 negative breast cancer defined as a negative in situ hybridization test or an IHC status of 0 or 1+ as per local laboratory testing

You CAN'T join if...

  1. Patient has locally recurrent or metastatic disease
  2. Patient has received any systemic therapy (e.g. chemotherapy, targeted therapy,immunotherapy) or radiotherapy for current breast cancer disease before randomization.
  3. Patient with type 1 diabetes mellitus or not adequately controlled type 2 diabetes mellitus
  4. History of acute pancreatitis within 1 year of study entry
  5. Uncontrolled hypertension
  6. Other protocol-defined inclusion/exclusion criteria may apply


  • Los Angeles Hematology/Oncology Medical Group Onc Dept.
    Los Angeles, California, 90017, United States
  • University of California at Los Angeles UCLA SC
    Los Angeles, California, 90095, United States


in progress, not accepting new patients
Start Date
Completion Date
Novartis Pharmaceuticals
Phase 2
Lead Scientist
Hope Rugo
Study Type
Last Updated
March 1, 2017