503 Tumor infiltrating lymphocytes in soft tissue sarcomas upregulate the exhaustion marker TIGIT and are reinvigorated by IL-15 stimulation and TIGIT blockade oleh Shuai Chen, Cordelia Dunai, Robert Rebhun, Arta Monjazeb, Ian Sturgill, Robert Canter, William Murphy, Yue Lyu, May Cho, Sean Judge, Morgan Darrow, Steven Thorpe, Alicia Gingrich, Edmond O’Donnell, Alyssa Bellini, Logan Vick, Kevin Stoffel