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- W1982373846 abstract "Gastrointestinal stromal tumor (GIST) is the most common mesenchymal tumor of the gastrointestinal tract. Since c-kit mutation occurs only in one-third of GIST, there might be other molecular mechanisms. Loss of heterozygosity (LOH), microsatellite instability (MSI) and NF2 gene mutation were investigated in 22 GISTs (9 low-risk and 13 high-risk tumors). LOH and MSI were evaluated using 41 markers on 21 chromosomal arms, and NF2 gene mutation was examined by PCR-SSCP. High frequency of LOH was observed on 14q (9 / 19, 47%), and 22q (17 / 22, 77%). The frequencies were similar in low-risk and high-risk tumors, and were unrelated with gastric or intestinal origin. Two other abnormalities, additional LOH on other chromosomes and MSI at more than two loci, were characteristic of the high-risk tumors (P < 0.05). NF2 gene mutation was identified in two cases showing 22q-LOH (8 bp deletion on the splice donor site of exon 7, and 1 bp insertion at position 432 of exon 4, which resulted in nonsense mutation). There was no significant correlation between these results and c-kit gene mutation, which was observed in 8 of 22 tumors. Suppressor genes on 14q and 22q may be involved, independently of c-kit gene mutation, in the development of GIST. NF2 contributes as a tumor suppressor in a small subset of GIST. These abnormalities are presumably followed by increased genetic instability." @default.
- W1982373846 created "2016-06-24" @default.
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- W1982373846 date "2000-12-01" @default.
- W1982373846 modified "2023-10-14" @default.
- W1982373846 title "Allelic Loss of 14q and 22q,<i>NF2</i>Mutation, and Genetic Instability Occur Independently of c-<i>kit</i>Mutation in Gastrointestinal Stromal Tumor" @default.
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- W1982373846 doi "https://doi.org/10.1111/j.1349-7006.2000.tb00910.x" @default.
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