Modification of 2D analysis protocol was developed, based on preliminary removal of major cellular proteins by extraction with buffer saline and elimination of high molecular weight proteins by gel filtration. This approach allowed identification of 12 proteins with increased expression levels in tumors versus normal tissues. Increase in expression levels of the eight proteins in colon tumors was discovered for the first time. We performed comparison of marker search efficiency by 2D analysis and SAGE in a control panel of 19 putative colon cancer markers, discovered by us previously and at the same time independently identified by other authors. Results of 2D analysis of control panel completely coincided with published data, as compared to search in SAGE database, which allowed identification of only one third of markers.
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