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• W2080559553 abstract "Molecular cytogenetic and loss of heterozygosity (LOH) analyses of non-small-cell lung cancer (NSCLC) have shown frequent allelic deletions in a variety of chromosomes, such as 1p, 3p, 5q, 8p, 9p, 11p, 11q, and 17p. Allelic loss at 3p21, 9p21, and 5q21 has also been reported in premalignant epithelial lesions of the bronchus and in normal bronchial cells. These findings suggest that a tissue field of somatic genetic alterations precedes the histopathological phenotypic changes of carcinoma. LOH at chromosomal regions 3p21, 5q21, 9p21, and 17p (TP53) was looked for in the peritumoural normal bronchial cells from 30 archival surgically resected tumours. Microdissected normal bronchial cells from 20 benign cytological smears were also added to the study. Matched populations of lymphocytes, tumour cells, and normal bronchial cells adjacent to the tumour were microdissected from paraffin-embedded tissues, while matched populations of normal bronchial cells and inflammatory cells were microdissected from benign cytological smears (bronchial brushings). Polymerase chain reaction (PCR) amplification was performed utilizing the specific markers D5S346, D3S1300, D9S157, D9S171, and TP53. Within the NSCLC tumour cells, LOH was more frequently found at the 5q21 locus (72% of the informative cases), the 3p21 locus (47%), 9p21 (48%), and 17p (33%). Within the peritumoural normal bronchial cells, LOH at 5q21 was found in 37.5% of the cases, 22% showed LOH at 3p21, 27% at 9p21, and 13% at 17p (TP53). LOH was also detected in one case, in normal bronchial cells obtained from cytological smears at one locus (5q21). In conclusion, normal bronchial mucosa adjacent to NSCLC has frequent allelic losses at 3p21, 5q21, and 9p21, while LOH at these loci is unusual in normal bronchial cells obtained from cytological smears from patients with no evidence of malignancy. LOH at these loci may be present before the onset of the malignant growth. LOH studies may supplement the histopathological evaluation of bronchial cells to detect genotypic alterations in both cytological and biopsy specimens." @default.
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• W2080559553 title "3p21, 5q21, and 9p21 allelic deletions are frequently found in normal bronchial cells adjacent to non-small-cell lung cancer, while they are unusual in patients with no evidence of malignancy" @default.
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• W2080559553 doi "https://doi.org/10.1002/path.987" @default.
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