We studied nucleolar organizers (Ag-NORS) in 20 cases of ocular limbic
tumours of which 7 were Bowen disease or intraepithelial carcinoma an
d 13 were invasive carcinomas. The NOR-Index, reflecting cellular acti
vity, increased from intraepithelial carcinoma (3, 97) to microinvasiv
e (5, 45) and invasive carcinoma (5, 81). Results of Nor-Index, reflec
ting proliferation, was in agreement with other technics such as immun
o-labelling with K(i67) and PCNA antibodies.