Histocompatibility typing in spontaneous regression of retinoblastoma.

Human Leukocyte Antigen (HLA) Typing of Caucasian patients with retinoblastoma fails to show any difference in antigen frequency compared to a control population. In family studies where several members are affected with retinoblastoma the tumor does not segregate with the HLA type. There is also no significant difference in antigen frequency between spontaneous regression of retinoblastoma, unregressed retinoblastoma, and normal controls. In several families with one member showing spontaneous regression of retinoblastoma, other generations inheriting the same haplotypes have tumors which have failed to regress.