Additional Study Information: The purpose of this study is to assess whether an investigational drug, called XmAb20717, has any effects on your cancer, and to determine if it is safe and well tolerated. XmAb20717 is a type of drug that can attach to 2 different proteins, call a bispecific antibody. These antibodies are designed to attach to a T-cell, a type of immune system cell, in your body and ultimately help the body to fight the cancer. An antibody is a special kind of protein that your body normally makes to fight infections and other types of harmful cells and substances in your body. Scientists can now produce antibodies in the laboratory to fight many different diseases, including types of cancer, in much the same way that the body naturally makes antibodies. XmAb20717 is this type of drug.