The trial is an open-label, multi-center safety trial of GEN1047. The trial consists of two parts: a dose escalation part (escalation - phase 1) and an expansion part (expansion - phase 2a). The goal of the dose escalation part is to find out if GEN1047 is safe in participants with specific solid tumors and to find the best dose(s). In the expansion part of the trial up to two doses of GEN1047 will be tested.
The drug investigated in the study is an antibody, GEN1047. Since this is the first study of GEN1047 in humans, the main purpose is to evaluate safety. Besides safety, the study will determine the recommended GEN1047 dose to be tested in a larger group of participants and assess preliminary clinical activity of GEN1047. GEN1047 will be studied in a broad group of cancer participants, having different kinds of solid tumors. All participants will get GEN1047. The study consists of two parts: Part 1 tests increasing doses of GEN1047 (escalation), followed by Part 2 (expansion) which tests the recommended GEN1047 dose from Part 1.