MYCN and osteosarcoma: The DRB1*15:01-DQA1*01:02-DQB1*06:02 haplotype was widely underrepresented, particularly in aRMS, osteosarcoma, neuroblastoma (MYCN-NA, MYCN-A, 11qWT), nephroblastoma, GBM and medulloblastoma (freq 0.038 to 0.073, RA 0.31 to 0.58) but overrepresented in eRMS (freq.