On November 29, 2021 G1 Therapeutics, Inc. (Nasdaq: GTHX), a commercial-stage oncology company, reported that the Company has initiated a Phase 2, single arm, open-label study of trilaciclib administered prior to the antibody-drug conjugate (ADC), Trodelvy (sacituzumab govitecan-hziy) in patients with unresectable locally advanced or metastatic triple-negative breast cancer (TNBC) (Press release, G1 Therapeutics, NOV 29, 2021, View Source [SID1234596203]). Antitumor efficacy and myeloprotective endpoints are being assessed in this trial. Initial results of this study are expected in the second half of 2022.
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"All of our clinical programs are designed to maximize the utility of trilaciclib and evaluate its ability to transform treatments for patients living with cancer, including potential synergies with newer promising agents, such as ADCs," said Raj Malik, M.D., Chief Medical Officer at G1 Therapeutics. "We are excited to develop this combination in TNBC, an area where trilaciclib in our Phase 2 trial and Trodelvy have both shown clinically meaningful and substantial improvements in overall survival and could act synergistically to improve patient outcomes with fewer myelosuppressive side effects. We believe strongly in the clinical rationale underlying this combination and that the data generated from this study will be instructive as we contemplate combinations of trilaciclib and ADCs in other treatment settings and tumor types."
Patient recruitment in this trial is now underway. Approximately 40 patients will be enrolled in this exploratory 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 TNBC who received at least 2 prior treatments, at least 1 in the metastatic setting. Trilaciclib will be administered as a 30-minute IV infusion completed within 4 hours prior to the start of sacituzumab govitecan-hziy treatment on day 1 and day 8 of each 21-day cycle.
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 primary objective is to evaluate the anti-tumor efficacy of trilaciclib when administered prior to sacituzumab govitecan-hziy as measured by progression-free survival (PFS). Key secondary endpoints include evaluation of the anti-tumor efficacy as measured by the objective response rate (ORR), duration of objective response (DOR), clinical benefit rate (CBR), and overall survival (OS); and evaluation of the myeloprotective effects of trilaciclib.
About Triple Negative Breast Cancer (TNBC)
According to the American Cancer Society, nearly 300,000 new cases of invasive breast cancer are diagnosed annually in the U.S. Triple-negative breast cancer makes up approximately 15-20% of such diagnosed breast cancers. TNBC is cancer that tests negative for estrogen receptors, progesterone receptors, and excess HER2 protein. Because mTNBC cells lack key growth-signaling receptors, patients do not respond well to medications that block estrogen, progesterone, or HER2 receptors. Instead, treating mTNBC typically involves chemotherapy, radiation, and surgery. TNBC is considered to be more aggressive and have a poorer prognosis than other types of breast cancer. In general, survival rates tend to be lower with mTNBC compared to other forms of breast cancer, and mTNBC is also more likely than some other types of breast cancer to return after it has been treated, especially in the first few years after treatment. It also tends to be higher grade than other types of breast cancer.