The purpose of this study is to characterize safety and to determine the putative recommended Phase 2 dose(s) (RP2D\[s\]), optimal dosing schedule(s) and route(s) of administration of JNJ-80948543 in Part A (Dose Escalation) and to further characterize the safety of JNJ-80948543 at the putative RP2D(s) in Part B (Cohort Expansion).