PT - JOURNAL ARTICLE AU - C Hanski AU - G Bornhoeft AU - N Topf AU - U Hermann AU - H Stein AU - E O Riecken TI - Detection of a mucin marker for the adenoma-carcinoma sequence inhuman colonic mucosa by monoclonal antibody AM-3. AID - 10.1136/jcp.43.5.379 DP - 1990 May 01 TA - Journal of Clinical Pathology PG - 379--384 VI - 43 IP - 5 4099 - http://jcp.bmj.com/content/43/5/379.short 4100 - http://jcp.bmj.com/content/43/5/379.full SO - J Clin Pathol1990 May 01; 43 AB - The monoclonal antibody AM-3 was raised against mucins extracted from human colorectal carcinomas. It reacted strongly with sections of paraffin wax embedded colorectal carcinoma. In colonic adenoma tissue the percentage of cells expressing the epitope detected by AM-3 correlated with the degree of dysplasia. In contrast to immunohistochemical staining, which did not show the presence of the antigen in histologically normal mucosa, the more sensitive enzyme linked immunosorbent assay (ELISA) and immunoblot assays showed that it was weakly expressed in this tissue. AM-3 reacted with variable frequency with several normal and malignant human tissues, indicating that the detected epitope is not restricted to colonic tissue. In colonic carcinomas it is present on a sialomucin of apparent relative molecular mass of more than 440,000. These data suggest that the antigen detectable with AM-3 may be useful in the assessment of premalignant changes in colonic adenomas.