Abstract
PURPOSE:p53 and E-cadherin mutations are associated with a high risk of metastatic potential and local recurrence after colorectal surgery. LoVo, a human colon cancer cell line expressing a wild-typep53 and a normal E-cadherin, was studied. Clone LoVo-XC17 was obtained from LoVo cells transfected with a vector bearing ap53 273his mutation. Clone LoVo-92R4 was obtained from LoVo by culture cells with an E-cadherin down-regulation. LoVo, LoVo-XC17, and LoVo-92R4 were studied forin vivo behavior in a surgical intracolonic graft model. METHODS: Ten nude mice were used per cell line. A colonic tumor was obtained by tumor implantation into the cecal wall. The cecal tumor was resected at Day 15; at this time the volumes of the different tumors were similar. RESULTS: Surgical resection of the LoVo tumor led to 100 percent disease-free animals at one month. Surgical resection of mice grafted with the LoVo-XC17 line did not cure any mice (0/10;P = 0.001). Mice had local recurrences (10/10), mesenteric lymph node metastases (9/10), liver metastases (2/10), and peritoneal carcinomatosis (8/10). Surgical resection of LoVo-92R4 tumors led to cures in 30 percent (3/10), whereas 70 percent had isolated mesenteric lymph node metastases (7/10;P = 0.003). CONCLUSION: In this model surgical tumor resection was consistently effective for colonic tumors with functionalp53 and E-cadherin, it was consistently ineffective with tumors displaying a mutatedp53, and it was partially effective with E-cadherin-deficient tumors. This study shows that the alteration of a single gene can be associated with a profound alteration of surgical resection benefit.
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Supported in part by the Ligue Nationale contre le Cancer and by the Société Nationale Française de Gastroentérologie, with grants for Marc Pocard. Philip Debruyne is a research assistant with the “Bijzonder Onderzoeks Fonds Universiteit Gent,” supported in part by the Belgian Cancer association and the Fund for Scientific Research—Flanders.
Read at The American Society of Colon and Rectal Surgeons' 100th Anniversary and Tripartite Meeting, Washington, D.C., May 1 to 6, 1999.
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Pocard, M., Debruyne, P., Bras-Gonçalves, R. et al. Single alteration ofp53 or E-cadherin genes can alter the surgical resection benefit in an experimental model of colon cancer. Dis Colon Rectum 44, 1106–1112 (2001). https://doi.org/10.1007/BF02234630
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DOI: https://doi.org/10.1007/BF02234630