Study of Tissue and Blood Samples From Patients With Low-Grade Glioma
Summary
RATIONALE: Studying samples of tumor tissue and blood from patients with cancer in the laboratory may help doctors learn more about changes that occur in DNA and identify biomarkers related to cancer. It may also help doctors predict how patients will respond to treatment.
PURPOSE: This research study is looking at tissue and blood samples from patients with low-grade glioma.
Description
OBJECTIVES:
- Evaluate the diagnostic and prognostic relevance of alterations of specific chromosomes and chromosomal regions including 7, 9p, 10p, 10q, 13q, 17p, 17q, 19q, 22q, X, and Y, using PCR analysis of microsatellite repeats and FISH.
- Evaluate the diagnostic and prognostic relevance of DNA ploidy by flow cytometric analysis; compare with ploidy determination by FISH.
- Assess the diagnostic and prognostic relevance of various markers of cellular proliferation and cellular function including flow cytometric determination of %S-phase, %G2M, and immunohistochemical evaluation of PCNA, Ki-67, and p53.
OUTLINE: Previously preserved paraffin-embedded tissue blocks are obtained and used for biomarker studies. Blood samples obtained during treatment are also obtained. Loss of heterozygosity of specific chromosomal regions are performed using PCR analysis of microsatellite repeats (41,118-120) on DNA extracted from the paraffin-embedded archival specimens. FISH and flow cytometry may also be used to assess chromosomal loss of deletion. Immunohistochemistry is also performed.
Study Design
N/A
Conditions
Brain and Central Nervous System Tumors
Intervention
fluorescence in situ hybridization, loss of heterozygosity analysis, polymerase chain reaction, flow cytometry, immunohistochemistry staining method
Location
Mayo Clinic Scottsdale
Scottsdale
Arizona
United States
85259-5499
Status
Recruiting
Source
National Cancer Institute (NCI)
Results (where available)
Links
- Source: http://clinicaltrials.gov/show/NCT01004523
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
In Situ Hybridization, Fluorescence
A type of IN SITU HYBRIDIZATION in which target sequences are stained with fluorescent dye so their location and size can be determined using fluorescence microscopy. This staining is sufficiently distinct that the hybridization signal can be seen both in metaphase spreads and in interphase nuclei.
Spectral Karyotyping
The simultaneous identification of all chromosomes from a cell by fluorescence in situ hybridization (IN SITU HYBRIDIZATION, FLUORESCENCE) with chromosome-specific florescent probes that are discerned by their different emission spectra.
Molecular Diagnostic Techniques
MOLECULAR BIOLOGY techniques used in the diagnosis of disease. Included are such techniques as IN SITU HYBRIDIZATION of chromosomes for CYTOGENETIC ANALYSIS; OLIGONUCLEOTIDE ARRAY SEQUENCE ANALYSIS of gene expression patterns in disease states; identification of pathogenic organisms by analysis of species specific DNA sequences; and detection of mutations with POLYMERASE CHAIN REACTION.
Primed In Situ Labeling
A technique that labels specific sequences in whole chromosomes by in situ DNA chain elongation or PCR (polymerase chain reaction).
Taq Polymerase
A heat stable DNA-DIRECTED DNA POLYMERASE from the bacteria Thermus aquaticus. It is widely used for the amplification of genes through the process of POLYMERASE CHAIN REACTION. EC 2.7.7.-.
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