No abstract available
MeSH terms
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Adult
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Aged
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DNA, Neoplasm / blood*
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DNA, Neoplasm / genetics
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Female
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Gastrointestinal Neoplasms / blood
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Gastrointestinal Neoplasms / genetics*
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Genes, ras*
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Humans
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Male
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Middle Aged
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Mutation*
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Polymerase Chain Reaction
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Polymorphism, Restriction Fragment Length