CD8A and neoplasm: The presence of CD8+ T cells in the tumor bed and invasive margin is strongly associated with disease-free survival and overall survival in CRC and the “immune score”, quantifying the density and location of immune cells within the tumor, has provided prognostic value that may be superior to the American Joint Committee on Cancer/Union for International Cancer Control (AJCC/UICC) tumor (T), nodes (N), and metastases (M) (TNM) classification in CRC [11,12].