Perlmutter Cancer Center

This is a first time in human (FTIH), open-label, non-randomized, multicenter study designed to evaluate the safety, tolerability, pharmacokinetics (PK), pharmacodynamics, and preliminary clinical activity of GSK3174998 administered intravenously to subjects with selected advanced or recurrent solid tumors. This dose-escalation study will assess the safety, activity of GSK3174998 as monotherapy (Part 1), in combination with pembrolizumab (Part 2), and potentially in combination with additional therapies. The study will be conducted in 2 parts, each part consisting of a dose-escalation phase followed by a cohort expansion phase. Part 1 will evaluate GSK3174998 monotherapy, while Part 2 will evaluate GSK3174998 in combination with pembrolizumab. GSK3174998 will first be evaluated as monotherapy in escalating doses. Once a dose of GSK3174998 has been identified that is both tolerable and demonstrates pharmacodynamic activity, enrollment of Part 2 may begin. In Part 2, escalating doses of GSK3174998 will be evaluated with fixed doses of pembrolizumab. The study will enroll up to approximately 264 subjects with different tumor types (approximately 144 subjects in Parts 1A and 2A [dose escalation]; approximately 120 subjects in Parts 1B and 2B [cohort expansion]). The maximum duration of treatment with GSK3174998 plus or minus pembrolizumab will be 2 years or 35 cycles, whichever comes first. The follow-up period for safety assessments will be a minimum of 3 months from the date of the last dose. The post-treatment follow-up period includes disease assessments every 12 weeks.