Recently, we have discovered ways to reinvigorate the immune system to fight cancer. However, in immune cancers such as lymphoma, the line between cancer and the immune system is blurred. This presents an opportunity to learn how immune cells attack cancer under complex conditions, which is called the tumor microenvironment. I propose to use a spatial protein analysis technology to identify clues, not just in cancer cells but also in the embedded immune cells, that predict cancer outcomes. Furthermore, I will study how genetically engineered anti-tumor immune cells operate in the tumor microenvironment to improve their efficacy.