Table I.

Parameters used in the various systems for the histological grading of malignancy.

Authors	Year	Parameters	Refs.
Wahi	1971	Keratinization of individual cells, formation of horn pearls, presence of intercellular bridges, number and aspect of mitosis figures, degree of cell and nuclear pleomorphism and presence of multi-nucleated giant cells.	(4)
Jakobsson et al	1973	Neoplastic structure, keratinization, nuclear pleomorphism, number of mitoses, mode and stage of invasion, vascular invasion and lymphoplasmocyte inflammatory infiltrate.	(5)
Crissman, Gluckman, Cummings	1984	Degree of keratinization, nuclear pleomorphism, number of mitoses, invasion pattern, inflammatory infiltrate and vascular invasion.	(6)
Anneroth, Batsakis, Luna	1987	Degree of keratinization, cell pleomorphism, number of mitoses, invasion pattern, stage of invasion and lymphoplasmocyte inflammatory infiltrate.	(7)