This study aims to understand how safe and effective a drug called **BMS-986523** is for people with advanced solid tumors. Solid tumors are abnormal growths of tissue that are usually firm. The study will test BMS-986523 alone and with other cancer-fighting drugs to see how well it works and how patients handle it. To join, participants must have a tumor with a specific change in a gene called **KRAS**. This change can make the tumor hard to treat. People with certain other illnesses or untreated brain tumors cannot join. Participants should have already tried standard treatments or decided not to undergo them. **Key Points:** - **Participation involves**: Different treatment arms and requires a specific kind of tumor. - **Health requirements**: No untreated brain tumors or recent severe skin reactions. - **Study goal**: Check safety and effectiveness of the drug. Remember, it's important to talk to your doctor to understand if participating in this study is right for you and to know more about the potential benefits and risks involved.