HLA-DRB1 and glioblastoma: The DRB1*07:01-DQA1*02:01-DQB1*02:02 haplotype was overrepresented in aRMS, GBM and medulloblastoma (freq 0.182 to 0.196, RA 1.84 to 1.98) but underrepresented in nephroblastoma (freq.