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- W1558672110 abstract "Total mesorectal excision (TME) is the standard treatment for rectal cancer, while transanal endoscopic microsurgery (TEM) is a recently introduced surgical approach for the treatment of rectal adenomas. Incorrect preoperative staging before TEM is a problem. Therefore the aim of this thesis was to identify molecular differences between rectal tumors of different stages, using gene expression profiling and genomic analysis. First protocols and data analysis algorithms for a new type of SNP array were developed. These studies showed that reliable LOH and copy number changes could be obtained from both frozen and paraffin embedded material. Consequently SNP arrays were used to type groups of TEM and TME treated samples. Five genomic events were found which could make a clear discrimination between adenomas and carcinomas. Early carcinomas treated by TEM, which were not recognized preoperatively as carcinomas, showed already carcinoma-associated aberrations. Analysis of tree core biopsies per patient showed a large degree of intra- tumor heterogeneity; although a good correlation was obtained between the biopsy with the largest number of aberrations and its corresponding tumor fraction. Gene expression array analysis was performed on the same samples as the SNP array series. A high concordance between chromosomal aberrations and changes in gene expression was observed. Finally a clinical application of these data is discussed in the preoperative staging of rectal tumours." @default.
- W1558672110 created "2016-06-24" @default.
- W1558672110 creator A5076006564 @default.
- W1558672110 date "2008-06-19" @default.
- W1558672110 modified "2023-09-23" @default.
- W1558672110 title "Molecular discrimination of sessile rectal adenomas from carcinomas for a better treatment choice : integration of chromosomal instability patterns and expression array analysis" @default.
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