Abstract
To clarify the keratin staining patterns of invasive carcinoma of the oesophagus, 22 cases of formalin-fixed paraffin-embedded surgical specimens were examined immunohistochemically with the labelled streptavidin biotin method using a panel of six different monoclonal anti-keratin antibodies. The antibody reacted adequately when antigen was retrieved in a microwave oven, and the relationship between morphological characteristics and keratin reaction patterns was analyzed in carcinomas and compared with adjacent histologically normal epithelium. In the normal oesophageal epithelium, AE3 and CK8.12 labelled all layer of cells, KS-1A3, E3 and KL1 labelled suprabasal cells, and LL002 selectively labelled the basal cells. In squamous cell carcinomas, AE3, CK8.12, KL1 and LL002 labelled almost all the tumour cells regardless of their differentiation, E3 only labelled keratinized cells, while marked decrease or loss of KS-1A3 staining was seen in all cases examined. Therefore, the characteristic profile of squamous cell carcinoma was a strong and diffuse expression of keratin 14 and 16, strong but localized expression of keratin 17, and loss of keratin 13 expression. Undifferentiated carcinoma totally lacked all keratin reactivity. Th...Continue Reading
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