Antihemophilic factor release by perfused liver and spleen: relationship to hemophilia.

As judged by perfusion of isolated organs an antihemophilic factor is produced in the liver and the spleen. Perfusates (from hemophiliacs) that are deficient in the human anti-hemophilic factor stimulate production of the factor during perfusion. Apparently there is an antihemophilic-factor-stimulating substance in the plasma of hemophiliacs. The data suggest that splenic homotransplantation might alleviate the symptoms of hemophilia.