eISSN: 2084-9869
ISSN: 1233-9687
Polish Journal of Pathology
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vol. 68
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Intratumoral heterogeneity for inactivating frameshift mutation of CUX1 and SIRT1 genes in gastric and colorectal cancers

Yun Sol Jo, Min Sung Kim, Nam Jin Yoo, Sug Hyung Lee

Pol J Pathol 2017; 68 (3): 258-260
Online publish date: 2017/11/30
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Both CUX1 and SIRT1 are considered tumor suppressor genes (TSGs), but it is not known whether CUX1 and SIRT1 alterations are different between high microsatellite instability (MSI-H) and microsatellite stable MSI (MSS) cancers. We identified frameshift mutations of CUX1 in 4 cases of colorectal cancer (CRC) and of SIRT1 in 1 case of gastric cancer (GC) and 3 cases of CRC. All of them were found in GC or CRC with MSI-H (3.5% of MSI-H for each gene), but neither in GC nor CRC with MSS. In addition, we analyzed intratumoral heterogeneity (ITH) of the CUX1 frameshift mutation and found that two CRCs (12.5%) harbored regional ITH of the frameshift mutation. Our data indicate that there exist frameshift mutations of CUX1 and SIRT1 genes as well as ITH of CUX1 frameshift mutation in MSI-H cancers, which together might play a role in tumorigenesis of GC and CRC with MSI-H.

CUX1, SIRT1, tumor suppressor, mutation, intratumoral heterogeneity

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