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Recent studies have identified the distinctexistence of flat-type colorectal tumors. The lowincidence of ras gene mutations in these tumors suggeststhat their genetic pathways of tumor progression may be different from those of the polypoid type.To elucidate further genetic alterations in flat-typecolorectal tumors, codon 201Arg/Glypolymorphism in the DCC (deleted in colorectalcarcinoma) gene was...
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