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- W2182711704 abstract "To identify tissue biomarkers that might be used to assess an individual's cancer risk and response to chemoprevention, we studied in dysplastic lesions of the larynx and the p.o. cavity, a series of biomarkers extensively used in previous chemoprevention trials, including chromosome polysomy (CP), proliferative status, p53 expression and gene mutations, and loss of heterozygosity at 9p, 3p, and 17p.Biopsies from 32 participants in a prospective chemoprevention trial using 13-cis-retinoic acid, IFN-alpha, and alpha-tocopherol for 12 months (20 with vocal cord and 12 with p.o. cavity lesions) were analyzed for p53 and Ki-67 expression by immunohistochemistry, loss of heterozygosity by PCR amplification, p53 mutations by PCR-based direct sequencing, and CP by in situ hybridization.High CP (> or =4% cells with more than three chromosome copies per nucleus) was more common in p.o. (8 of 10) than laryngeal lesions (4 of 16; P = 0.01), and so was a combination of CP > or = 4% and parabasal layer p53 labeling index > or = 0.2 (P = 0.02). Low CP was a significant predictor of complete histological response (8 of 14 cases with low versus 1 of 12 cases with high CP; P = 0.01). A trend for histological progression or cancer development was observed in cases with high CP and parabasal layer p53 labeling index.Low CP, more frequently observed in laryngeal lesions, appears to be a predictor of response to chemoprevention and could be used as a screening tool to identify suitable candidates for such approaches. Further investigation of biological parameters of response and cancer risk is warranted." @default.
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- W2182711704 date "2002-12-01" @default.
- W2182711704 modified "2023-10-18" @default.
- W2182711704 title "Biologic correlates of a biochemoprevention trial in advanced upper aerodigestive tract premalignant lesions." @default.
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