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char = .;code = 46
result sql = [A preliminary study on p53 gene in lung cancer tissues of workers exposed to silica and welding fumes].
[A preliminary study on p53 gene in lung cancer tissues of workers exposed to silica and welding fumes].
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result sql = Mutations of suppressor gene p53 was studied in 36 cases of silica related lung cancer and 6 cases of welding fume related lung cancer with immunohistochemical and PCR-SSCP methods. Cancer tissues were embedded in paraffin and stored for 13.4 years in average. Results revealed that there was abnormal mobility shift of electrophoresis in 18 cases with 20 point mutations of 42 specimens tested, accounted for 42.9%, and 50% (10/20) of the mutations were clustered in exon 8. This finding differed from mutational spectrum of gene in non-occupational lung cancer, in which mutation frequency of exon 8 ranged from 17.5% to 23.5%. Gene mutation frequency in varied pathological categories of pneumoconiosis related lung cancer also differed from that in common lung cancer. In the latter, the highest one was in small cell lung cancer (70%) and the lowest in adenocarcinoma (33%), but in the former, the highest in adenocarcinoma (53.9%) and the lowest in small cell lung cancer (30.8%). Immunohistochemical observations also showed a very high prevalence of p53 gene mutation expression (46.9%). Sequencing, which was determined in two cases of this study, revealed that two point mutations all occurred in non-hotspot codon 144 of p53 gene. Difference in gene mutation spectrum suggests that there exist specific carcinogens and carcinogenesis in silica and welding fume related lung cancer.

Publication: Zhonghua Yu Fang Yi Xue Za Zhi 1997 May ;31(3)::153-6.
Publication Date: 1997 May
Study Author(s): Liu, B;Zhou, P;Miao, Q;
Institution: Institute of Occupational Medicine, Chinese Academy of Preventive Medicine, Beijing.
Shortcut link to this study:
Mutations of suppressor gene p53 was studied in 36 cases of silica related lung cancer and 6 cases of welding fume related lung cancer with immunohistochemical and PCR-SSCP methods. Cancer tissues were embedded in paraffin and stored for 13.4 years in average. Results revealed that there was abnormal mobility shift of electrophoresis in 18 cases with 20 point mutations of 42 specimens tested, accounted for 42.9%, and 50% (10/20) of the mutations were clustered in exon 8. This finding differed from mutational spectrum of gene in non-occupational lung cancer, in which mutation frequency of exon 8 ranged from 17.5% to 23.5%. Gene mutation frequency in varied pathological categories of pneumoconiosis related lung cancer also differed from that in common lung cancer. In the latter, the highest one was in small cell lung cancer (70%) and the lowest in adenocarcinoma (33%), but in the former, the highest in adenocarcinoma (53.9%) and the lowest in small cell lung cancer (30.8%). Immunohistochemical observations also showed a very high prevalence of p53 gene mutation expression (46.9%). Sequencing, which was determined in two cases of this study, revealed that two point mutations all occurred in non-hotspot codon 144 of p53 gene. Difference in gene mutation spectrum suggests that there exist specific carcinogens and carcinogenesis in silica and welding fume related lung cancer.
PMID: 9812593

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