HLA-C and ependymoblastoma: Embryonal tumors (ATRT, ETMR, MRT, and medulloblastoma) were with similarly low expression levels, with medians spanning 6.0–7.2 for HLA-A, 3.9–6.5 for HLA-B, and 5.9–8.0 for HLA-C, indicating limited HLA class I-mediated immune visibility.