CD74 and neoplasm: We found that CD74 was expressed at any level in tumor cells in 164 of the 555 cores (1+, 2+, and 3+ scores; 29.5%); CD74 was also expressed in immune cells in more than half of the samples (342 out of 555 samples, or 61.6%), which was consistent with its known physiological expression in cells such as dendritic cells and B cells [58].