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• W2103262956 abstract "A monoclonal antibody (323/A3) with a high degree of selectivity for binding to breast cancer cells was produced by immunization of mice with MCF-7 human breast cancer cells. The antigen recognized by 323/A3 on MCF-7 appears to be surface localized, and by enzyme-linked immunosorbent assay, the antibody was found to bind strongly with four of six breast cancer cell lines examined while no binding was detectable with nonbreast cancer cell lines. In vivo distribution of the 323/A3 antigen was screened by immunoperoxidase staining of formalin-fixed paraffin sections of normal human tissues and tumors. Among breast tissues, positive staining was detected with 75% (6 of 8) of metastatic lymph nodes, 59% (76 of 128) of primary breast tumors, 20% (13 of 63) of benign breast lesions, and 0% (0 of 10) of normal breast. No immunostaining was detected with a large variety and number of other normal human tissues with the exception of staining observed with epithelium of normal colon. Antigen distribution appears not to be disease specific, since positive staining was also observed with adenocarcinomas other than breast. The antigen recognized by the 323/A3 antibody was identified by Western blot analysis as a Mr 43,000 protein. The glycoprotein nature of the antigen was demonstrated by its binding to concanavalin A, specific elution with sugar, and immunoprecipitation of a Mr 43,000 radiolabeled protein from extracts of MCF-7 cells after pulse labeling with [3H]glucosamine. The 323/A3 antigen appears to be the same Mr 43,000 protein in cell lines as in breast tumors in vivo. Based on a comparison with the molecular weights of other known tumor-associated antigens and with their immunocytochemical tissue distribution, the Mr 43,000 glycoprotein described here represents a tumor-associated antigen previously undescribed in breast cancer or in other tumors. Since the Mr 43,000 glycoprotein is present on the surface of most breast cancer cells and is either absent or expressed at very low levels in most normal tissues including normal breast, the monoclonal antibody described here may have potential applications in diagnosis and management of breast cancer." @default.
• W2103262956 created "2016-06-24" @default.
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• W2103262956 date "1986-03-01" @default.
• W2103262956 modified "2023-09-23" @default.
• W2103262956 title "Monoclonal antibody identification and characterization of a Mr 43,000 membrane glycoprotein associated with human breast cancer." @default.
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• W2103262956 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3510721" @default.
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