Abstract
Monoclonal antibodies CC49 and B72.3, which recognize a tumor associated glycoprotein (TAG-72) related to sialyted Tn antigen, have been used in clinical trials for radionuclide imaging, and treatment of colon, breast and ovarian carcinoma. In addition, studies with CC49 in patients with metastatic hormone refractory prostate cancer have been initiated based on the observed expression of TAG-72 in primary prostate cancer. We examined whether TAG-72 expression is a common feature of primary, metastatic and hormonally treated prostatic carcinoma. Immunohistochemical analysis of 25 primary prostatic carcinomas confirmed previous data that 21 of 25 specimens (80%) were immunoreactive with CC49. CC49 staining was noted in all 6 well (Gleason score 2 to 4), 8 of 10 moderately (Gleason score 5 to 6) and 7 of 9 poorly (Gleason score 7 to 9) differentiated tumors. CC49 immunoreactivity was noted in 10 of 20 hormonally treated prostate cancers and in 21 of 25 tumors without hormonal therapy. Intense CC49 staining of prostatic intraepithelial neoplasia was present in all 5 specimens examined. In contrast to the primary lesion, many metastatic prostate cancers lacked detectable CC49 immunoreactivity. Of 24 pelvic lymph node metastases from...Continue Reading
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