1. Characterization and clinical evaluation of microsatellite instability and loss of heterozygosity within tumor-related genes in colorectal cancer
- Author
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Zhongtao Zhang, Meng Guo, Qingxian Lu, Zhenwen Chen, Jin Wang, Xiaoyan Du, Xueyun Huo, Changlong Li, Xiaohong Li, Shuangyue Zhang, Dandan Feng, Zhigang Bai, and Zhenkun Li
- Subjects
Oncology ,Male ,medicine.medical_specialty ,congenital, hereditary, and neonatal diseases and abnormalities ,Colorectal cancer ,Antineoplastic Agents ,Biology ,QH426-470 ,Loss of heterozygosity ,Cohort Studies ,Internal medicine ,medicine ,Biomarkers, Tumor ,Tumor-related genes ,Genetics ,Mucinous carcinoma ,Humans ,Gene ,neoplasms ,Genetics (clinical) ,Aged ,Neoplasm Staging ,Aged, 80 and over ,Microsatellite instability ,nutritional and metabolic diseases ,Middle Aged ,medicine.disease ,Prognosis ,Survival Analysis ,RC31-1245 ,Human genetics ,digestive system diseases ,Exact test ,stomatognathic diseases ,Biomarker (medicine) ,Female ,Colorectal Neoplasms ,Research Article - Abstract
BackgroundMicrosatellite instability (MSI) is a biomarker for better outcomes in colorectal cancer (CRC). However, this conclusion is controversial. In addition, MSs can be a useful marker for loss of heterozygosity (LOH) of genes, but this finding has not been well studied. Here, we aimed to clarify the predictive value of MSI/LOH within tumor-related genes in CRC.MethodsWe detected MSI/LOH of MSs in tumor-related genes and the Bethesda (B5) panel by STR scanning and cloning/sequencing. We further analyzed the relationship between MSI/LOH status and clinical features or outcomes by Pearson’s Chi-square test, Fisher’s exact test and the Kaplan–Meier method.ResultsThe findings indicated that the MSI rates of B5 loci were all higher than those of loci in tumor-related genes. Interestingly, MSI/LOH of 2 loci in the B5 panel and 12 loci in tumor-related genes were associated with poorer outcomes, while MSI/LOH of the B5 panel failed to predict outcomes in CRC. MSI of BAT25, MSI/LOH of BAT26 and MSI of the B5 panel showed closer relationships with mucinous carcinoma. In addition, LOH-H of the B5 panel was associated with increased lymphatic metastasis.ConclusionsIn summary, MSI/LOH of certain loci or the whole panel of B5 is related to clinical features, and several loci within tumor-related genes showed prognostic value in the outcomes of CRC.
- Published
- 2021