New trends in the application of morphological tumor markers

New trends of tumor classification or prognosis based upon the investigation of the expression of growth factors and cell receptors, especially the expression of EGF and NGF and their receptors. Further views are the aplication of the methods of hybridization and karyotypic analysis for tumor characterization and estimation of malignant potency. The recognition of tumor cell heterogeneity is of practical clinical importance, especially for a better therapeutic strategy