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Expression of TRAIL and TRAIL Receptors in Colon Carcinoma: TRAIL-R1 Is an Independent Prognostic Parameter¹

Department of Pathology, University of Ulm, 89081 Ulm [J. S., K. K., P. M.]; Section of Surgical Oncology, Department of Surgery [U. H., C. H., T. L.] and Department of Pathology [G. M.], University of Heidelberg, 69120 Heidelberg; and Deutsches Krebsforschungszentrum, 69120 Heidelberg [H. W.], Germany

Purpose: Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) selectively induces apoptosis in cancer cells and may be involved in protection from metastases. TRAIL receptor (TRAIL-R) 1 and TRAIL-R2, but not TRAIL-R3 and TRAIL-R4, mediate apoptosis. We examined the expression of TRAIL and its receptors in normal and neoplastic colon epithelium, and studied its correlation with prognosis in colon cancer.

Experimental Design: Immunohistochemistry was performed on normal colon mucosa (n = 10), colon adenomas (n = 20), and R0-resected Unio Internationale Contra Cancrum stage II/III colon carcinomas (n = 129). Disease-free survival was examined by Kaplan-Meier estimates and the log-rank test. Prognostic factors were determined by multivariate Cox-analysis.

Results: In normal colon mucosa, TRAIL and TRAIL-R2 were expressed mostly in the surface epithelium, whereas TRAIL-R1 and TRAIL-R4 were detected all along the crypt axis. In adenomas, this expression pattern was mostly retained, although some adenomas also neoexpressed TRAIL-R3. In carcinomas, the expression of TRAIL and TRAIL receptors was much more variable. TRAIL, TRAIL-R2, TRAIL-R3, and TRAIL-R4 expression did not correlate statistically with disease-free survival (multivariate analysis: P = 0.54, P = 0.67, P = 0.45, and P = 0.69, respectively), but TRAIL-R1 expression was significantly associated with disease-free survival in colon cancer (multivariate analysis: P = 0.003).

Conclusions: TRAIL-R1 is an independent prognostic factor in R0-resected Unio Internationale Contra Cancrum stage II/III colon cancer.

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