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Trilaciclib

Phase 2

Metastatic Triple-Negative Breast Cancer | Small molecule | Oncology |Merck & Company, Inc.|Last Updated: Aug 20, 2026

Target and mechanism

Molecular targetCDK6, CDK4
Target classInhibitor
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment36

FDA Designations

No designations recorded

Clinical trial landscape

Trilaciclib · 1 trial · 1 indication

Phase 2 1
NCT06027268Phase II Trial of Trilaciclib, Pembrolizumab, Gemcitabine and Carboplatin in Metastatic Triple-Negative Breast CancerMetastatic Triple-Negative Breast Cancer
ACTIVE NOT_RECRUITING36 Analytics
PHASE2ACTIVE NOT_RECRUITING
Phase II Trial of Trilaciclib, Pembrolizumab, Gemcitabine and Carboplatin in Metastatic Triple-Negative Breast Cancer
Metastatic Triple-Negative Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Objective Response
6 months (initiation of protocol directed therapy until either a partial response is achieved or treatment discontinuation)

Objective according to RECIST v1.1 criteria

Secondary Endpoints

Progression-free survival
1 year (initiation of protocol directed therapy until documented disease progression, death, or end of follow-up period)
Duration of response
1 year (time from first disease assessment that shows a PR or complete response (CR) until documented disease progression, death, or end of follow-up period)
Overall survival
1 year (initiation of protocol directed therapy until documented death, or end of follow-up period])
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Trilaciclib, Pembrolizumab, Gemcitabine, and CarboplatinEXPERIMENTALTrilaciclib is an agent that helps protect the bone marrow from the side effects of chemotherapy. It is given as an intravenous (IV) infusion over 30 minutes prior to gemcitabine and carboplatin. Gemcitabine is given IV over 30 minutes. Carboplatin is given over 30 minutes. Trilaciclib, gemcitabine and carboplatin are given on Days 1 and 8 every 21 days. Pembrolizumab is given IV over 30 minutes on Day 1 every 21 days.

Interventions

NameTypeDescription
TrilaciclibDRUGIV infusion Day 1 and Day 8 every 21 days, at dose of 240 mg/m2
PembrolizumabDRUGIV infusion Day 1 every 21 days, at dose of 200 mg
GemcitabineDRUGIV infusion Day 1 and Day 8 every 21 days, at dose 1000 mg/m2
CarboplatinDRUGIV infusion Day 1 and Day 8 every 21 days, at dose area under curve (AUC) 2 (maximum of 300 mg)
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: 1. Written informed consent and HIPAA authorization for release of personal health information signed by the patient 2. Male or female with locally advanced unresectable or metastatic TNBC 3. Age ≥ 18 years at the time of consent 4. Eastern Cooperative Oncology Group (ECOG) Perf...

Countries:United States
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Frequently asked questions about Trilaciclib

What is Trilaciclib used for in metastatic triple-negative breast cancer?

Trilaciclib is being studied for the treatment of metastatic triple-negative breast cancer. It is an investigational small molecule being evaluated in combination with pembrolizumab, gemcitabine, and carboplatin in a Phase 2 clinical trial. The drug is not yet approved and remains in clinical development.

What does Trilaciclib target?

Trilaciclib targets cyclin-dependent kinases (CDKs), as it belongs to the -ciclib class of CDK inhibitors. By inhibiting CDKs, the drug is designed to modulate cell cycle progression. This mechanism is being explored in the context of metastatic triple-negative breast cancer treatment.

Who makes Trilaciclib?

Trilaciclib is being developed by Merck & Company, Inc., a biopharmaceutical company traded on the New York Stock Exchange under the ticker symbol MRK. The company is conducting clinical research to evaluate the drug's safety and efficacy in metastatic triple-negative breast cancer.

What phase is Trilaciclib in?

Trilaciclib is currently in Phase 2 clinical development. It is being investigated as a treatment for metastatic triple-negative breast cancer. The drug is investigational and has not been approved by regulatory authorities. One active Phase 2 trial is ongoing, with enrollment completed.

What clinical trials is Trilaciclib in?

Trilaciclib is being studied in a Phase 2 trial with the identifier NCT06027268. The trial is titled 'Phase II Trial of Trilaciclib, Pembrolizumab, Gemcitabine and Carboplatin in Metastatic Triple-Negative Breast Cancer.' It is active but not recruiting, with a planned enrollment of 36 participants in the United States.

Is Trilaciclib the same as Cosela?

Trilaciclib is also known by the brand name Cosela. The drug is being developed by Merck & Company, Inc. under the ticker MRK. In the context of metastatic triple-negative breast cancer, it is being evaluated in a Phase 2 clinical trial.