Study of Biomarkers in Tissue Samples From Patients With Metastatic Colon Cancer

2014-08-27 03:18:02 | BioPortfolio


RATIONALE: Studying samples of tumor tissue from patients with cancer in the laboratory may help doctors identify and learn more about biomarkers related to cancer.

PURPOSE: This research study is looking at biomarkers in tissue samples from patients with metastatic colon cancer.



- Determine the effect of surgical resection, in terms of physiological stress, on levels of tumor markers such as protein kinase A (PKA) expression in patients with metastatic colon cancer.

- Estimate variation among patients of baseline tumor markers in tumor tissue and sera.

- Correlate markers in tumor tissues with that in sera in these patients.

- Establish a tissue bank of these specimens for future studies.

OUTLINE: Biopsy and surgical specimens are obtained before and during standard surgery (patients may have had tumor tissue obtained before study entry and stored). Serum samples and tumor tissue are analyzed by immunohistochemistry and western blot. Tumor markers (such as PKA expression) are determined and marker levels are measured in serum samples and tissues.

PROJECTED ACCRUAL: Approximately 30 patients will be accrued for this study.

Study Design



Colorectal Cancer


western blotting, immunohistochemistry staining method, laboratory biomarker analysis


Lombardi Comprehensive Cancer Center at Georgetown University Medical Center
District of Columbia
United States




National Cancer Institute (NCI)

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:18:02-0400

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Medical and Biotech [MESH] Definitions

A method that is used to detect DNA-protein interactions. Proteins are separated by electrophoresis and blotted onto a nitrocellulose membrane similar to Western blotting (BLOTTING, WESTERN) but the proteins are identified when they bind labeled DNA PROBES (as with Southern blotting (BLOTTING, SOUTHERN)) instead of antibodies.

A method that is derived from western blotting (BLOTTING, WESTERN) and is used to detect protein-protein interactions. The blotted proteins are probed with a non-antibody protein which can then be tagged with a labeled antibody.

A method (first developed by E.M. Southern) for detection of DNA that has been electrophoretically separated and immobilized by blotting on nitrocellulose or other type of paper or nylon membrane followed by hybridization with labeled NUCLEIC ACID PROBES.

A method of chemical analysis based on the detection of characteristic radionuclides following a nuclear bombardment. It is also known as radioactivity analysis. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.

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