This study will see if the study drug, GI-102, alone or in combination with conventional anti- cancer drugs, pembrolizumab or trastuzumab deruxtecan, has an effect on the tumor and whether it causes any side effects. This study is to test study drugs in people with all types of solid tumors (certain tumor types for some groups). Pembrolizumab, which is approved in the USA and some other countries, is available by prescription to treat several different cancers, but is not approved to treat all types of cancer in this study. GI-102 is still experimental and is not approved by any regulatory...