A Study of ASP3082 in Adults With Previously Treated Solid Tumors

Study Purpose

This is an open-label study. This means that people in this study and clinic staff will know that they will receive ASP3082. The study aims to check how safe and well-tolerated ASP3082 is for people with advanced solid tumors that have a specific mutation called KRAS G12D. This study will be in 2 parts. In Part 1, different small groups of people will receive lower to higher doses of ASP3082 by itself, or together with cetuximab. Any medical problems will be recorded at each dose. This is done to find suitable doses of ASP3082, by itself or together with cetuximab, to use in Part 2 of the study. The first group will receive the lowest dose of ASP3082. A medical expert panel will check the results from this group and decide if the next group can receive a higher dose of ASP3082. The panel will do this for each group until all groups have received ASP3082 (by itself or together with cetuximab) or until suitable doses have been selected for Part 2. In Part 2, ASP3082 will be given in by itself, or in combination with other chemotherapy agents. Study treatments will be given through a vein. This is called an infusion. Each treatment cycle is 21 or 28 days long. They will continue treatment until: they have medical problems from the treatment they can't tolerate; their cancer gets worse; they start other cancer treatment; or they ask to stop treatment.