for females ages 18 years and up (full criteria)
study started
estimated completion
Principal Investigator
by Sara Hurvitz, MD (ucla)



The purpose of this study is to evaluate the mechanism of action, as well as the safety and efficacy of trilaciclib in combination with standard of care treatment in the neoadjuvant setting of early-stage triple negative breast cancer (TNBC). This study will have four phases: 1) Screening Phase, 2) Trilaciclib Lead-In Phase, 3) Treatment Phase, and 4) Surgery and Follow-Up Phase. After a screening phase of up to 21 day, each participant will receive trilaciclib single-dose monotherapy during the lead-in phase, followed by a tumor biopsy. During the treatment phase, each participant will receive trilaciclib with standard of care chemotherapy. Immunotherapy may be included during the treatment phase, per standard of care. 3-5 weeks following conclusion of the treatment phase, each participant will undergo definitive surgery. A 30-day Safety Follow-up Visit will occur 30 days after the last dose of trilaciclib and an End of Study Visit will occur within 14 days after definitive surgery.

Official Title

A Phase 2, Open-Label, Single-Arm Study of Single-Dose Lead-In and Neoadjuvant Trilaciclib and Chemotherapy in Patients With Early-Stage Triple Negative Breast Cancer (TNBC)


Triple Negative Breast Cancer Breast Cancer CDK4/6 Inhibitor trilaciclib dihydrochloride Cosela Immuno-oncology Solid tumor Chemotherapy-induced myelosuppression Myeloprotective Cyclin-dependent kinase 4/6 inhibitor Neoadjuvant HER2-negative TNBC Breast cancer surgery Trilaciclib Myeloprotection pembrolizumab carboplatin doxorubicin cyclophosphamide Dose-dense anthracycline/cyclophosphamide paclitaxel Chemotherapy Breast Neoplasms Triple Negative Breast Neoplasms Cylophosphamide Carboplatin (Investigator discretion) Pembrolizumab (Investigator discretion) Trilaciclib plus chemotherapy


You can join if…

Open to females ages 18 years and up

  • Suitability of therapy and patient intends to undergo curative surgery
  • Documented diagnosis of estrogen receptor (ER)-negative and progesterone receptor (PR)-negative tumor
  • Primary tumor ≥ 2 cm with any nodal status
  • Provide archival tissue for the baseline tissue sample
  • ECOG performance status of 0 or 1
  • Demonstrates adequate organ function
  • Research tumor biopsies including at least one on-treatment biopsy (and additional biopsy at baseline, if required)
  • Participants of child bearing potential must be willing to use 2 forms of contraception during the study and for 6 months following study treatment

You CAN'T join if...

  • Prior systemic therapies or radiation for current breast cancer
  • History of invasive malignancy ≤3 years prior to signing informed consent except for adequately treated basal cell or squamous cell skin cancer or in situ cervical cancer
  • History of breast cancer including ipsilateral ductal carcinoma in situ (DCIS) treated with radiotherapy at any time
  • Previous exposure to doxorubicin of more than 200 mg/m2 (as lifetime exposure to doxorubicin is not to exceed 450 mg/m2)
  • For patients who will receive pembrolizumab:
  • History of active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids, or immunosuppressive drugs). Replacement therapy is not considered a form of systemic treatment
  • Diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drugs
  • History of (non-infectious) pneumonitis that required steroids or current pneumonitis
  • Known history of active tuberculosis (Bacillus Tuberculosis)
  • History of severe hepatic impairment
  • Uncontrolled ischemic heart disease or uncontrolled symptomatic congestive heart failure (Class II-IV as defined by the New York Heart Association [NYHA] functional classification system)
  • Known history of stroke, cerebrovascular accident, severe/unstable angina, myocardial infarction, or coronary angioplasty/stenting/bypass grafting within 6 months prior to enrollment
  • Known serious active infection (e.g., human immunodeficiency virus [HIV], hepatitis B or C, tuberculosis).
  • Women who are pregnant or breastfeeding
  • Participation in other studies involving active treatment with investigational drug(s)
  • Prior hematopoietic stem cell or bone marrow transplantation


  • UCLA Department of Medicine - Hematology/Oncology accepting new patients
    Santa Monica California 90404 United States
  • Cancer and Blood Specialty Clinic accepting new patients
    Los Alamitos California 90720 United States
  • Providence Medical Foundation accepting new patients
    Fullerton California 92835 United States
  • PIH Health accepting new patients
    Whittier California 90602 United States

Lead Scientist at UC Cancer

  • Sara Hurvitz, MD (ucla)
    Professor, Medicine. Authored (or co-authored) 149 research publications


accepting new patients
Start Date
Completion Date
G1 Therapeutics, Inc.
Phase 2 Breast Cancer Research Study
Study Type
Expecting 30 study participants
Last Updated