HLA-A and plexiform neurofibroma: Immunohistochemical staining of HLA-A/B/C and β2-microglobulin (B2M)—major histocompatibility complex (MHC) genes involved in antigen presentation, T cell recruitment and activation—revealed that benign neurofibromas with nodular histology and MPNST exhibited a higher average expression of HLA-A/B/C compared to diffuse and plexiform neurofibromas [113].