The purpose of this study is to assess how the study drugs, AMG 193 and IDE397, move throughout the body, how the study drugs work in the body, whether they are safe, and an effective treatment option for people with advanced solid tumors lacking methylthioadeosine phosphorylase (MTAP) in the DNA (genetic material). Lacking MTAP may limit the way in which the enzyme, protein arginine methyltransferase 5 (PRMT5) works. PRMT5 is important for cancer cell survival and works with an enzyme methionine adenosyltransferase 2A (MAT2A). AMG193 may further slow down PRMT5 activity and kill cancer cells...