Trilaciclib in Patients Receiving Sacituzumab Govitecan-hziy for Triple Negative Breast Cancer

G1 Therapeutics

Status and phase: Completed; Phase 2

Conditions: Triple Negative Breast Cancer

Treatments: Drug: Sacituzumab Govitecan-hziy; Drug: Trilaciclib

Study type: Interventional

Funder types: Industry

Identifiers

NCT05113966

G1T28-213

Details and patient eligibility

About

This is a Phase 2, multicenter, open-label, single arm study evaluating the safety and efficacy of trilaciclib administered prior to sacituzumab govitecan-hziy in patients with unresectable, locally advanced or metastatic triple-negative breast cancer (TNBC) who received at least 2 prior treatments, at least 1 in the metastatic setting.

Full description

The study will include 3 study phases: Screening Phase, Treatment Phase, and Survival Follow-up Phase. The Treatment Phase begins on the day of the first dose of study treatment and completes at the Safety Follow-up Visit. Trilaciclib and sacituzumab govitecan-hziy will be administered intravenously (IV) in 21-day cycles. Study drug administration will continue until progressive disease per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 or clinical progression as determined by the Investigator, unacceptable toxicity, withdrawal of consent, Investigator decision, or the end of the study, whichever occurs first. The first Survival Follow-up assessment should occur approximately 3 months after the Safety Follow-Up Visit and will continue every 3 months until the end of the study (or death).

Enrollment: 30 patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Adult ( ≥18 years of age), female or male patient with measurable (per RECIST v1.1), unresectable locally advanced or metastatic TNBC

2. Documentation of histologically or cytologically confirmed ER-negative, PR-negative, and HER2-negative tumor per the American Society of Clinical Oncology (ASCO) and the College of American Pathologists (ASCO/CAP) criteria.

3. Patient must have had documented disease progression during or after 2 lines of systemic chemotherapy treatment for unresectable, locally advanced or metastatic breast cancer (these regimens will qualify regardless of TNBC status at the time they were administered):

   • One prior line of chemotherapy treatment could be in the neoadjuvant or adjuvant setting if progression occurred within 12 months of completion of chemotherapy;
   • Patients must have prior taxane treatment in either the neoadjuvant, adjuvant, or advanced/metastatic setting OR patients must have demonstrated contraindications or are intolerant to taxanes;
   • PARP inhibitors may meet the criteria for one of two lines of therapy if the patient has documented germline BRCA1/BRCA2 mutation.

4. ECOG performance status of 0 or 1.

5. Adequate organ function as demonstrated by the following laboratory values:

   • Hemoglobin ≥9.0 g/dL
   • Absolute neutrophil count (ANC) ≥1.5 × 10^9/L;
   • Platelet count ≥100 × 10^9/L;
   • Estimated glomerular filtration rate ≥30 mL/minute/1.73 m^2;
   • Total bilirubin ≤1.5 × upper limit of normal (ULN);
   • ALT and AST ≤3 × ULN in the absence of liver metastasis or ≤5 × ULN in the presence of liver metastasis.

6. Capable of giving signed informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form and in this protocol.

Exclusion criteria

1. Prior treatment with trilaciclib, sacituzumab govitecan-hziy, irinotecan, Trop-2 antibody drug conjugate, or any therapy with a topoisomerase-1 payload.
2. Patients with known brain metastasis at enrollment.
3. Patients with known Gilbert's disease or known homozygous for the UGT1A1*28 allele.
4. Patients with bone-only disease.
5. Malignancies other than TNBC within 3 years prior to enrollment.
6. History of clinically significant gastrointestinal bleeding, intestinal obstruction, or gastrointestinal perforation within 6 months of enrollment.
7. Receipt of any high dose systemic corticosteroids within 2 weeks prior to the first dose of study treatment.
8. Current use of immunosuppressive medication.
9. Uncontrolled ischemic heart disease or uncontrolled symptomatic congestive heart failure (Class III or IV as defined by the New York Heart Association functional classification system).
10. History of stroke or cerebrovascular accident within 6 months prior to first dose of study treatment.
11. Serious active infection or severe infection within 4 weeks prior to enrollment.
12. Prior hematopoietic stem cell or bone marrow transplantation.
13. Pregnant or lactating women

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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30 participants in 1 patient group

Trilaciclib + Sacituzumab Govitecan-hziy

Experimental group

Description:

During the Treatment Phase patients will receive trilaciclib + sacituzumab govitecan-hziy on days 1 \& 8 of a 21 day cycle. Trilaciclib is administered first, followed by sacituzumab govitecan-hziy. Administer diluted trilaciclib solution as a 30-minute IV infusion to be completed within 4 hours prior to the start of sacituzumab govitecan-hziy.

Treatment:

Drug: Trilaciclib

Drug: Sacituzumab Govitecan-hziy