[Immunohistochemistry expression of 3 markers (CEA, UEA-I and Ki-67) in nasal inverted papillomas]

Immunohistochemistry evaluation of the expression of degeneration and proliferation markers of the benign form of Schneiderian inverted papillomas in the ORL sphere, in the nondysplastic, dysplastic and degenerated forms. Seeking out an expression profile with a prognostic value.

44 surgical specimens were analyzed in two groups: A= 33 benign and B= 11 degenerated. Group A included: 10 dysplastic lesions, 4 septal lesions and 2 isolated sphenoidal lesions. A simultaneous bipolar localization belonged to the two groups (nasal, benign and otologic malignant). A control group consisted often biopsies of healthy mucous membranes harvested during septoplasties. The carcinoembryonic antigen (CEA), the ulex europaeus agglutinin I (UEA-I) and the monoclonal antibody Ki-67 were revealed by immunoreaction with peroxidase and enhanced by streptavidine-biotine.

There was a significant difference in the marking of the CEA between the control group and groups A (p< 0.023) and B (p< 0.045). This expression was fulfilled only in the superficial layers in 84.1% of cases. There was no difference in expression between groups A and B, the dysplastic and non-dysplastic inverted papillomas and between the various degrees of dysplasias. There was no significant statistical difference in expression of UEA-I between all the groups and the sub-groups. The expression of Ki-67 was significantly increased in groups A (p< 0.00023) and B (p< 0.05) when compared to the control group. But, no difference existed between groups A and B, the various sub-groups and the benign specific localizations. This expression was present in the basal cells. An expression encompassing all the thickness of the epithelium was generally associated with a degenerated or dysplastic lesion, without being systematic.

It was not possible using this specimen and for these three glycoproteins to extricate immunohistochemistry profiles of expression associated to the studied clinical and histological forms. However the expression of Ki-67 in more than 50% of the cells involving the full epithelium thickness would seem to suggest a particular cellular behavior Whereas the expression of the protein remains generally confined to the basal and suprabasal layers, a more significant population of Ki-67+ cells disseminated in the epithelium, would signify a tendency of the epithelium to escape the regulation mechanisms. This cellular behavior could constitute a prognostic histological marker but it would require a broader study to be confirmed.