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Brief Title: Study of MT-8421 as Monotherapy and in Combination With Nivolumab in Patients With Selected Advanced Solid Cancer Types
Official Title: A Phase 1 Open-label, Multicenter, Dose-ranging Study to Investigate Safety and Tolerability, Efficacy, Pharmacokinetics, Pharmacodynamics, and Immunogenicity of MT-8421 as Monotherapy and in Combination With Nivolumab in Patients With Selected Advanced Solid Cancer Types
Study ID: NCT06034860
Brief Summary: This is a Phase 1, open-label, dose escalation and expansion study of MT-8421 (an Engineered Toxin Body (ETB)) as monotherapy and in combination with nivolumab in patients with selected advanced solid cancer types. MT-8421 is an investigational drug that specifically targets and depletes cytotoxic T-lymphocytes-associated protein 4 (CTLA-4) expressing cells in an effort to directly dismantle the tumor microenvironment for the treatment of patients with advanced solid tumors.
Detailed Description: This study is conducted in two parts. The study will enroll up to 200 total participants (up to 40 in Part A and up to 160 in Part B). Part A (Dose Escalation) is designed to estimate the maximum tolerated dose (MTD) of MT-8421 as monotherapy and in combination with nivolumab. Part B (Dose Expansion) is designed to identify the dose(s) to be studied in Phase 2. The drug being tested in this study is called MT-8421. The study will evaluate safety, tolerability, efficacy, pharmacokinetics, pharmacodynamics, and immunogenicity of MT-8421 as monotherapy and in combination with nivolumab in patients with selected advanced solid cancer types. MT-8421 will be given as an intravenous (IV) infusion on Days 1, 8, 15, and 22 of a 28-day cycle. H1 and H2 blockers and anti-pyretics will be given to all patients as pre-medication prior to each dose in Cycle 1. Anti-pyretics will be required for 24 hours after the first dose in Cycle 1. Use of pre-medication will be at the discretion of the Investigator for subsequent doses. In Parts A and B, a subject may participate for the following three (3) periods: * Screening Period- up to 28 days before the first dose of MT-8421 * Treatment Period- active period where a subject will receive doses of MT-8421 over a 28-day treatment period. * Follow-up Period- up to 24 months after the second short term follow up visit. In both parts of the study, participants can receive MT-8421 until their cancer worsens, side effects prevent further study treatment, or until the participant leaves the study for other reasons decided by the participant, the study doctor, or the sponsor of the study. After the second short term follow up visit participants will have a check -up of their disease every 12 weeks for 24 months. The overall duration of the study will vary for each participant because study treatment will continue until unacceptable toxicity, withdrawal of consent, death, termination of the study by the sponsor, or fulfilment of another discontinuation criterion.
Minimum Age: 18 Years
Eligible Ages: ADULT, OLDER_ADULT
Sex: ALL
Healthy Volunteers: No
The Angeles Clinic, Los Angeles, California, United States
Horizon Oncology Research, LLC, Lafayette, Indiana, United States
Washington University in St. Louis, Saint Louis, Missouri, United States
Weill Cornell Medicine, New York, New York, United States
NEXT Oncology, Fairfax, Virginia, United States
Name: Admasu Mamuye, MD
Affiliation: Molecular Templates
Role: STUDY_DIRECTOR