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Chromosomal arm losses and gains as determined by CGH analysis (see methods) is shown for 3 groups of primary colorectal cancers: true MSI cancers (16 cases) for which the 3-marker MSI test was positive, putative MSI cancers (4 cases) for which the NCI 5-marker test was positive but the 3-marker test was negative, and MSS cancers (5 cases). Chromosomal arm gain is shown in black; arm loss is shown in white
