Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector7930810.17816/kazmj79308Review (Book)Histological prognosis of malignant tumors150519292555735743008202130082021Copyright © 1929, Eco-Vector1929<p>Broders, proceeding from a far from new indication that the tumor will be the more benign, the more differentiated its cellular elements, divides cancers into 4 groups according to the degree of malignancy.</p>Kazan Medical archiveКазанский медицинский архив