Certain aspects of the use of new method of microscopy in oncology.

Electron microscopic studies on human neoplasms demonstrated that the typical cells fo individual neoplasms retain the ability of showing their specific ultrastructural differentiation. This fact provides theoretical basis for the use of electron microscopy in oncological practice for purposes of differential diagnosis. It also allows rejection of the concept of "dedifferentiation" and ultrastructural "simplification" as main ways of formation of neoplastic cells.