[Tissue culture investigations on the distinction between hereditary and sporadic retinoblastoma (author's transl)].

The growth pattern in tissue culture of cells derived from retinoblastoma is different for all cases with known heredity and most of the cases with unknown heredity. It is concluded that those of the latter, that show a growth pattern that is identical with that of the hereditary cases, represent the hereditary cases in the group with unknown heredity.