Trilaciclib, a CDK4/6 Inhibitor, in Patients With Early-Stage Triple Negative Breast Cancer

  • End date
    Feb 24, 2023
  • participants needed
  • sponsor
    G1 Therapeutics, Inc.
Updated on 27 May 2022
triple negative breast cancer
progesterone receptor
estrogen receptor


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.

Condition Triple Negative Breast Cancer, Breast Cancer
Treatment Paclitaxel, doxorubicin, Trilaciclib, Cylophosphamide, Carboplatin (Investigator discretion), Pembrolizumab (Investigator discretion)
Clinical Study IdentifierNCT05112536
SponsorG1 Therapeutics, Inc.
Last Modified on27 May 2022


Yes No Not Sure

Inclusion Criteria

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

Exclusion Criteria

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
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