HLA-DOA and adrenal cortex carcinoma: Furthermore, as illustrated in Figure 5C, the expression of CD93 was positively associated with HLA-DOA (major histocompatibility complex, class II, DO alpha) and HLA-DPA1 (major histocompatibility complex, class II, DP alpha 1) in PAAD, as well as HLA-E (major histocompatibility complex, class I, E) in ACC and PCPG.