Clinical trial · Interventional
Trilaciclib (G1T28), a CDK 4/6 Inhibitor, in Combination With Gemcitabine and Carboplatin in Metastatic Triple Negative Breast Cancer (mTNBC)
Phase 2 Study of the Safety, Efficacy, and Pharmacokinetics of G1T28 in Patients With Metastatic Triple Negative Breast Cancer Receiving Gemcitabine and Carboplatin Chemotherapy
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Why stopped (as posted): Primary Analysis and survival follow up completed per protocol. Not stopped due to safety concerns
Summary
Brief summary (as posted)
This was a study to investigate the potential clinical benefit of trilaciclib (G1T28) in preserving the bone marrow and the immune system, and enhancing chemotherapy antitumor efficacy when administered prior to carboplatin and gemcitabine (GC therapy) for participants with metastatic triple negative breast cancer. The study was an open-label and 102 participants were randomly assigned (1:1:1 fashion) to 1 of the 3 following treatment groups: * Group 1: GC therapy (Days 1 and 8 of 21-day cycles) only (n=34) * Group 2: GC therapy (Days 1 and 8) plus trilaciclib (G1T28) on Days 1 and 8 of 21-day cycles (n=33) * Group 3: GC therapy (Days 2 and 9) plus trilaciclib (G1T28) on Days 1, 2, 8, and 9 of 21-day cycles (n=35) The study included 3 study phases: Screening Phase, Treatment Phase, and Survival Follow-up Phase. The Treatment Phase begins on the day of first dose with study treatment and completes at the Post-Treatment Visit.
Conditions
Conditions (4)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Breast Cancer | Malignant Breast Neoplasm | CURATED_EXACT | 0.92 |
| Breast Neoplasm | Breast Neoplasm | ONTOLOGY_EXACT | 0.98 |
| Triple-Negative Breast Cancer | Triple-Negative Breast Carcinoma | ALIAS | 0.90 |
| Triple-Negative Breast Neoplasms | Triple-Negative Breast Carcinoma | ALIAS | 0.90 |
Interventions
Interventions (3)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| Carboplatin | Drug | Carboplatin | ALIAS |
| Gemcitabine | Drug | Gemcitabine | ALIAS |
| Trilaciclib | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (3)
- type
- EXPERIMENTAL
- label
- Group 1: Gemcitabine/Carboplatin (Days 1 and 8)
- description
- Participants received Intravenous (IV) infusion of standard GC chemotherapy (gemcitabine 1000 milligrams per meter square \[mg/m\^2\] and carboplatin area under the curve \[AUC\] 2) on Days 1 and 8 of 21-day cycle. The carboplatin dose was calculated using the Calvert formula, with a target AUC 2 (maximum 300 mg).
- interventionNames
- Drug: Gemcitabine
- Drug: Carboplatin
- type
- EXPERIMENTAL
- label
- Group 2: Trilaciclib + Gemcitabine/ Carboplatin (Days 1 and 8)
- description
- Participants received IV infusion of trilaciclib 240 mg/m\^2 plus GC chemotherapy (gemcitabine 1000 mg/m\^2 and carboplatin AUC 2) IV infusion on Days 1 and 8 of 21-day cycle. Trilaciclib was administered prior to chemotherapy.
- interventionNames
- Drug: Trilaciclib
- Drug: Gemcitabine
- Drug: Carboplatin
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
Show eligibility criteria text
Inclusion Criteria: * Confirmed diagnosis of hormone receptor (HR)-negative, human epidermal growth factor receptor 2 (HER2)-negative (locally recurrent or metastatic TNBC) breast cancer * Available TNBC diagnostic tumor tissue (archived tissue allowed) * Evaluable disease * Eastern Cooperative Oncology Group (ECOG) performance status 0 to 1 * Adequate organ function * Predicted life expectancy of 3 or more months Exclusion Criteria: * More than 2 prior chemotherapy regimens for locally recurrent or metastatic TNBC. If \> 12 months have elapsed between the date of last adjuvant/neoadjuvant chemotherapy administration and first documented local or distant disease recurrence the therapy will not be considered a line of therapy in the locally recurrent or metastatic TNBC setting. * CNS metastases or leptomeningeal disease requiring immediate treatment with radiation therapy or steroids. * Investigational drug within 30 days of first trilaciclib (G1T28) dose * Concurrent radiotherapy, radiotherapy within 14 days of first trilaciclib (G1T28) dose * Cytotoxic chemotherapy within 3 weeks of first trilaciclib (G1T28) dose * Prior hematopoietic stem cell or bone marrow transplantation
References
Publications (2)
- BACKGROUNDTan AR, Wright GS, Thummala AR, Danso MA, Popovic L, Pluard TJ, Han HS, Vojnovic Z, Vasev N, Ma L, Richards DA, Wilks ST, Milenkovic D, Yang Z, Antal JM, Morris SR, O'Shaughnessy J. Trilaciclib plus chemotherapy versus chemotherapy alone in patients with metastatic triple-negative breast cancer: a multicentre, randomised, open-label, phase 2 trial. Lancet Oncol. 2019 Nov;20(11):1587-1601. doi: 10.1016/S1470-2045(19)30616-3. Epub 2019 Sep 28. PMID 31575503
- BACKGROUNDTan AR, Wright GS, Thummala AR, Danso MA, Popovic L, Pluard TJ, Han HS, Vojnovic Z, Vasev N, Ma L, Richards DA, Wilks ST, Milenkovic D, Xiao J, Sorrentino J, Horton J, O'Shaughnessy J. Trilaciclib Prior to Chemotherapy in Patients with Metastatic Triple-Negative Breast Cancer: Final Efficacy and Subgroup Analysis from a Randomized Phase II Study. Clin Cancer Res. 2022 Feb 15;28(4):629-636. doi: 10.1158/1078-0432.CCR-21-2272. PMID 34887261