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300Cyclin A and Cyclin D1 as Significant Prognostic Markersbetween patients with and without overexpressionof Ki-67.In conclusion, our results demonstrate thatcyclin D1, cyclin A, histone H3 and Ki-67 areoverexpressed in a subset of CRC cases. Overexpressionof both cyclin D1 and cyclin A correlateswith poor differentiation and tumor progression.Our results also indicate the superiorityof cylcin A and cyclin D1 as indicators of poorprognosis compared to Ki-67 and histone H3mRNA in colorectal carcinoma. Overexpressionof cyclin A and D1 is thus identified as a significant,independent prognostic factor for colorectalcarcinoma. Our findings in this regard are especiallyimportant in stage I and II patients sincethose patients usually have a poor prognosis inspite of being node-negative. Hence, in thisgroup of patients there is a great demand formore accurate, individually-based, biologicalprognostic factors that help in accurate predictionof the clinical outcome of the disease as well asin categorizing patients for appropriate therapeuticmodalities. If these findings are confirmedin a larger study, evaluation of cyclin A and D1may be applicable to clinical management ofCRC, allowing the identification of patients withpoor prognosis. It will also be valuable to comparethe prognostic impact of these two parametersin two separate groups including metastaticand non-metastatic CRC.REFERENCES1- Arber N., Hibshoosh,H., Moss S., Sutter T., Zhang Y.,Begg M., Wang S., Weinstein I. and Holt P.: Increasedexpression of cyclin D1 is an early event in multistagecolorectal carcinogenesis. Gastroenterol., 110: 669-674, 1996.2- Bartkova J., Lukas J., Strauss, M., and Bartek J.: ThePRAD-1/cyclin D1 oncogene product accumulatesaberrantly in a subset of colorectal carcinomas. 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