Sialosyl-Tn antigen: Initial report of a new marker of malignant progression in long-standing ulcerative colitis
1995; Elsevier BV; Volume: 109; Issue: 2 Linguagem: Inglês
10.1016/0016-5085(95)90337-2
ISSN1528-0012
AutoresSteven H. Itzkowitz, Andrew Marshall, Asher Kornbluth, Noam Harpaz, J.B. Duke McHugh, Dennis J. Ahnen, David B. Sachar,
Tópico(s)Cholangiocarcinoma and Gallbladder Cancer Studies
ResumoExpression of the mucin-associated carbohydrate antigen sialosyl-Tn (STn) correlates with malignant transformation in sporadic colonic neoplasms. The aim of this study was to analyze STn antigen expression in patients with long-standing ulcerative colitis (UC).STn antigen was assessed by immunohistochemistry in archival tissues. Study A was a retrospective chronological case-control study. Serial surveillance colonoscopic biopsy specimens without inflammation or dysplasia were analyzed in 7 patients who developed colon cancer and in 8 controls who did not develop colon cancer. Study B analyzed the anatomic distribution of STn expression in 17 cancer-bearing (case) and 6 cancer-free (control) colectomy specimens from patients with UC. In some colectomy specimens, STn was compared with aneuploidy, which was determined by flow cytometry.In study A, among the 7 patients with UC who developed cancer, 6 patients (86%) expressed STn in at least one prior nondysplastic surveillance biopsy specimen from the same site. Only 3 of 8 control patients (38%) expressed STn. In study B, STn was expressed in 40 of 82 specimens (49%) from cancer-bearing colons but only 8 of 62 specimens (13%) from cancer-free colons. STn was expressed in most aneuploid areas but was also found in diploid, nondysplastic mucosa.STn antigen seems to be a promising marker of cancer risk in patients with UC.
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