[Fetal placental antigens in the serum of tumor patients].

With the anti-placente rabbit serum three different placente antigens could be demonstrated in the serum of pregnant women and new borns, in ascites hydropic new borns and in liquor ammin. These fetal antigens could be also demonstrated in the serum of women with malignant and benign tumors. There was no identity with alpha1-fetal protein or C-reactive protein. It is discussed either the tumor cells synthesize fetal proteins directly or they produce substances which stimulate the organism for production of these antigens.