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[Value of the morphological characteristics of choriocarcinoma in the prognosis of the disease].

Morphologic studies of 59 choriocarcinomas identified 56 histologic patterns which are of prognostic value. According to information index of Koulback, 17 of them were the most valuable (cytologic pattern of tumor, degree of polymorphism of cyto- and syncytiotrophoblast, mitotic activity of cytotrophoblast, type of tumor growth, degree of blood vessel invasion, etc.). Individual prognosis can be established on the basis of said characteristics, using the Neuman-Pearson procedure. The reliability of individual prognosis made in the study reached 93%.