The purpose of this trial is to learn about the safety and effectiveness of GEN1106 when it is used for the treatment of participants with certain types of cancer. The trial has multiple parts. The first part of the trial tests different doses of GEN1106 to find out if it is safe and determine what are the best doses to use. The second and third parts continues to test the safety of and how well GEN1106 works in additional participants with a specific cancer type and at doses chosen based on results from the first part of the trial. For each participant, the trial will last approximately 17 months but will vary for each person. This includes up to 21 days for screening prior to receiving trial treatment, approximately 5 months of treatment (the duration of treatment may vary for each participant), and approximately 11 months of follow up after trial treatment ends (the duration of follow up may vary for each participant). Participation in the trial will require visits to the site, with more frequent visits during the first 6 weeks of treatment and then less frequent visits afterwards. At site visits, there will be various tests (such as blood draws) and procedures (such as recording of heart activity, computed tomography \[CT\] scans) to monitor whether the treatment is safe and effective. All participants will receive active drug; no one will be given placebo.
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Part 1 Dose Escalation: Number of Participants with Dose Limiting Toxicities (DLTs)
Timeframe: 21 days
Part 1 Dose Escalation: Number of Participants with Adverse Events (AEs) and Serious Adverse Events (SAEs)
Timeframe: Up to approximately 16 months
Part 2 Dose Refinement: Number of Participants with AEs and SAEs
Timeframe: Up to approximately 16 months
Part 3 Expansion: Objective Response Rate (ORR) per Response Evaluation Criteria in Solid Tumors (RECIST) v1.1
Timeframe: Up to approximately 16 months