Furthermore, no HLA-A and only a single HLA-B or -C allele was detected from RNA-Seq of two rhabdomyosarcoma PDXs (GR-RMS-2 and -10), and single HLA-B and -C alleles were detected in two others (GR-RMS-1 and -11). This evidence concerns the gene HLA-B and rhabdomyosarcoma.