Dataset Information

Differential clinicopathological and molecular features within late-onset colorectal cancer according to tumor location.

ABSTRACT:

Background

Since there is a predilection of some clinical and molecular features for a given tumor location, we assessed whether this can be confirmed in late-onset colorectal cancer (LOCRC).

Results

Right colon cancers showed features associated with sporadic Microsatellite Instability: predominance of female cases and BRAF mutations, and an important mucinous component. Left colon cancers developed a higher number of polyps and multiple primary CRCs, showed the strongest familial component, and had better prognosis. Rectal cancers showed a predominantly sporadic phenotype, with worse prognosis and a CpG Island Methylator Phenotype (CIMP)-High. No copy number alterations (CNAs) greater than or equal to 50% were observed in this LOCRC group, and the most recurrent alterations were losses at 5q13 and 14q11, and gains at 7q11, 7q21-q22, 19p13-p12, 19q13 and 20p11-q11. KRAS and PIK3CA were the only mutated genes showing differences according to the tumor location, mainly for right colon cancers.

Materials and methods

We analyzed clinical and molecular characteristics of LOCRC at different tumor locations in order to determine if there are differential phenotypes related with the location in the colon.

Conclusions

Categorizing LOCRC according to tumor location appears to be an adequate first step to resolving the heterogeneity of this subset of CRC.

SUBMITTER: Brandariz L

PROVIDER: S-EPMC5880605 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature

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Publications

Differential clinicopathological and molecular features within late-onset colorectal cancer according to tumor location.

Brandariz Lorena L Arriba María M García Juan Luis JL Cano Juana María JM Rueda Daniel D Rubio Eduardo E Rodríguez Yolanda Y Pérez Jessica J Vivas Alfredo A Sánchez Carmen C Tapial Sandra S Pena Laura L García-Arranz Mariano M García-Olmo Damián D Urioste Miguel M González-Sarmiento Rogelio R Perea José J

Oncotarget 20180215 20

<h4>Background</h4>Since there is a predilection of some clinical and molecular features for a given tumor location, we assessed whether this can be confirmed in late-onset colorectal cancer (LOCRC).<h4>Results</h4>Right colon cancers showed features associated with sporadic Microsatellite Instability: predominance of female cases and <i>BRAF</i> mutations, and an important mucinous component. Left colon cancers developed a higher number of polyps and multiple primary CRCs, showed the strongest ...[more]

PMID: 29632645

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Project description:Alterations in glycosylation are seen in many types of cancer, including colorectal cancer (CRC). CRC is known to display glycosylation alterations. Glycans, the sugar moieties of glycoconjugates, are involved in many important functions relevant to cancer, such as cell signaling and adhesion, and may can be of value as biomarkers. In this study, we have used mass spectrometry to analyze the N-glycan profiles of 35 CRC tissue samples from patients with tumors in the right or left colon and 10 healthy tissue samples from non-CRC patients who underwent operations for other reasons. The tumor samples were divided into groups depending on tumor location (right or left colon) and stage (II or III), while the healthy samples were divided into right or left side of the colon. The levels of neutral and acidic N-glycan compositions and glycan classes were analyzed in a total of ten different groups. Surprisingly, there were no significant differences in glycan levels when all right- and left-sided CRC samples were compared, and few differences (such as in the abundance of the neutral N-glycan H3N5) were seen when the samples were divided according to both location and stage. Multiple significant differences were found in the levels of glycans and glycan classes when stage II and III samples were compared, and these glycans could be of value as candidates for new markers of cancer progression. In order to validate our findings, we analyzed healthy tissue samples from the right and left colon and found no significant differences in the levels of any of the glycans analyzed, confirming that our findings when comparing CRC samples from the right and left colon are not due to normal variations in the levels of glycans between the healthy right and left colon. Additionally, the levels of the acidic glycans H4N3F1P1, H5N4F1P1, and S1H5N4F1 were found to change in a cancer-specific but colon location-nonspecific manner, indicating that CRC affects glycan levels in similar ways, regardless of tumor location.

Dataset Information

Differential clinicopathological and molecular features within late-onset colorectal cancer according to tumor location.

Background

Results

Materials and methods

Conclusions

Publications

Differential clinicopathological and molecular features within late-onset colorectal cancer according to tumor location.

Similar Datasets

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