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Genetic detection of colorectal cancer cells in circulation and lymph nodes

  • Original Contributions
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Diseases of the Colon & Rectum

Abstract

PURPOSE: This study was undertaken to investigate the clinical implications of detection of genetic alterations in blood and lymph nodes in colorectal cancer patients. METHODS: The reverse transcriptase polymerase chain reaction product of the cytokeratin gene in blood was examined as a cancer cell-specific expression in 35 colorectal cancer patients. The K-ras or p53 gene mutations in the lymph nodes histopathologically negative for metastasis were studied by the mutant-allele-specific amplification method in 26 colorectal cancer patients. RESULTS; The reverse transcriptase polymerase chain reaction assay was able to detect a cytokeratin reverse transcriptase polymerase chain reaction product at a concentration from a single to ten colon cancer cells per 106 normal peripheral blood mononuclear cells. Cytokeratin reverse transcriptase polymerase chain reaction products were detected in nine patients' blood samples, although none of the samples were cytologically detectable. The blood's cytokeratin positivity correlated with the invasive mode of the tumor (P <0.05) and the presence of distant metastasis (P <0.01). Two (50 percent) of four patients whose blood was positive for cytokeratin had recurrences. Of 17 patients with the K-ras or p53 gene mutation in primary tumors, 9 (53 percent) had the corresponding mutations in lymph nodes. Mutation positivity in lymph nodes correlated with the presence of lymphatic invasion of the primary tumor (P <0.05). All patients with mutation-negative lymph nodes remained disease-free for more than two years after surgery. CONCLUSION: Detection of cytokeratin reverse transcriptase polymerase chain reaction products in the blood and K-ras or p53 gene mutations in the lymph nodes histologically negative for metastasis may be applicable for clinical use, despite some limitations, and may serve as a useful clinical factor for stratifying patients who are at high or low risk for recurrence after surgery.

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Supported in part by a Grant-in-Aid from the Ministry of Health and Welfare for a New 10-Year Strategy for Cancer Control, Japan.

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Nakamori, S., Kameyama, M., Furukawa, H. et al. Genetic detection of colorectal cancer cells in circulation and lymph nodes. Dis Colon Rectum 40 (Suppl 10), S29–S36 (1997). https://doi.org/10.1007/BF02062017

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