CD8A and gastrointestinal stromal tumor: In EWS sarcoma, CD8+ cells infiltration correlates with improved survival [5]; also in several STSs including gastrointestinal stromal tumor (GIST), leiomyosarcoma, cutaneous angiosarcoma, high-grade undifferentiated pleomorphic sarcoma and synovial sarcoma, the presence of tumor-infiltrating lymphocytes correlates with improved prognosis [36,37,38].