A Study of SGN-EGFRd2 in Advanced Solid Tumors

This study will test the safety of a drug called SGN-EGFRd2 in participants with advanced solid tumors. It will also study the side effects of this drug. A side effect is anything a drug does to the body besides treating the disease.
Participants will have cancer that cannot be removed (unresectable) or has spread through the body (metastatic).
This study will have three parts. Parts A and B of the study will find out how much SGN-EGFRd2 should be given to participants. Part C will use the dose found in parts A and B to find out how safe SGN-EGFRd2 is and if it works to treat solid tumor cancers.