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(American Journal of Pathology. 1999;154:993-999.)
© 1999 American Society for Investigative Pathology

Short Communication

Differential Expression of a New Tumor-Associated Antigen, TLP, During Human Colorectal Cancer Tumorigenesis

Fiorella Guadagni* , Paolo Graziano* , Mario Roselli{ddagger} , Sabrina Mariotti* , Paola Bernard{dagger} , Paola Sinibaldi-Vallebona§ , Guido Rasi{dagger} and Enrico Garaci§

From the Laboratory of Clinical Pathology,* Regina Elena Cancer Institute, Rome; the Institute of Experimental Medicine,{dagger} National Council of Research, Rome; and the Departments of Surgery{ddagger} and Experimental Medicine and Biochemical Sciences,§ University of Rome "Tor Vergata," Rome, Italy

Tumour liberated particles (TLP) have been proposed as a potential new serum tumor marker. In particular, a high percentage of patients with early stages of lung cancer scored positive for serum TLP, suggesting its possible role as a marker for early diagnosis of disease. The aim of the present study was to analyze the expression of TLP in the colorectal adenoma-carcinoma sequence in order to determine whether its expression correlates with the various stages of cancer transformation. TLP distribution was assessed by immunohistochemistry in normal, premalignant, and malignant colorectal lesions. Normal colonic mucosa and hyperplastic polyps showed no positive staining, whereas adenomas and adenocarcinomas reacted to anti-TLP serum. The percentage of positive tumor cells increased from adenomas with mild dysplasia to adenomas with severe dysplasia. Moreover, a supranuclear staining pattern was observed mainly in adenomas with mild dysplasia, whereas adenomas with severe dysplasia as well as adenocarcinomas showed a characteristic diffuse staining pattern and a strong staining intensity. Only a few cases of adenocarcinoma were found to be TLP-negative and all were poorly differentiated. Our results suggest that TLP antigen expression may be considered as a marker of epithelial atypia in the colorectal tract and as a potential target for new diagnostic and/or therapeutic approaches to human colorectal cancer.






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Copyright © 1999 by the American Society for Investigative Pathology.