No abstract available
MeSH terms
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Adult
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Aged
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Aged, 80 and over
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Carcinoma, Squamous Cell / genetics*
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Carcinoma, Squamous Cell / virology
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Esophageal Neoplasms / genetics*
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Esophageal Neoplasms / virology
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Female
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Genes, ras*
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Humans
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Japan / epidemiology
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Male
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Middle Aged
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Papillomaviridae / isolation & purification*
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Papillomavirus Infections / epidemiology*
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Proto-Oncogene Proteins p21(ras) / analysis*
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Tumor Suppressor Protein p53 / analysis*
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Tumor Virus Infections / epidemiology*
Substances
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Tumor Suppressor Protein p53
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HRAS protein, human
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Proto-Oncogene Proteins p21(ras)