Methylation Status of CD44 Promoter Region in Primary Lung Cancer

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00173680
Recruitment Status : Unknown
Verified August 2005 by National Taiwan University Hospital.
Recruitment status was:  Recruiting
First Posted : September 15, 2005
Last Update Posted : November 24, 2005
Information provided by:
National Taiwan University Hospital

Brief Summary:
This project is to study the methylation status of the transcriptional regulatory region of CD44 gene in surgically resected NSCLC specimens and normal lung tissue, correlate the methylation status of promoter region with the expression of CD44 gene, and analyze if methylation is associated with survival.

Condition or disease
Non-Small Cell Lung Cancer

Detailed Description:

CD44 is a cell surface receptor for the extracellular matrix hyaluronan. It mediates adhesion of cells to the extracellular matrix. Its ability to organize extracellular matrix into a medium is also used by cancer cells in their becoming metastatic. Invasive tumor cells are frequently observed to bind hyaluronate.

CD44 gene is made up of 20 exons, at least 10 of which are variably expressed due to alternative splicing of the mRNA. The standard form, CD44s, has a coding sequence of exons 1-5 and 16-20. Variant isoforms (CD44v), all larger, arise from alternative splicing of combinations of exons 6-15 (v1-10). A variant isoform CD44 can induce metastasis of a rat pancreatic carcinoma. Studies in human tumors, however, have produced variable results. Some breast cancers demonstrate positive correlation between CD44v expression and tumor progression, while others lack any correlation. Some colorectal tumors even show an inverse correlation. CD44 has also been demonstrated to be a metastasis suppressor gene for prostate cancer. Thus, CD44 may be a marker for metastasis for some tumors, but not for others, and it may actually be a metastasis suppressor gene for yet another groups of tumors.

For primary lung cancer, the correlation between CD44 expression and tumor metastasis has not been established. The metastasis-prone small cell lung cancer rarely showed any immunohistochemical staining for CD44s or CD44v. For non-small cell lung cancer (NSCLC), some studies showed positive correlation between immunohistochemical CD44v expression and tumor progression, while others showed no correlation. Our own study using RT-PCR, sequencing and immunohistochemical staining showed that in pulmonary adenocarcinoma, CD44v6 expression is down-regulated as the disease progressed. Based on our finding, and the observation that CD44s and CD44v expression are low in metastasis-prone small cell lung cancer, we assue that CD44 is a metastasis suppressor gene which is inactivated in lung cancers. Because in prostate cancer DNA hypermethylation has been shown to be related to the down-regulation of CD44 gene, we plan to study the methylation status of the transcriptional regulatory region of CD44 gene in primary lung cancer. We’ll study CD44 expression by immunohistochemistry, the methylation status of CD44 regulatory region by sequencing of the bisulfite-modified genomic DNA, and correlate these two findings with each other, and with histologic type, tumor staging and survival.

Study Type : Observational
Enrollment : 40 participants
Observational Model: Defined Population
Observational Model: Natural History
Time Perspective: Longitudinal
Time Perspective: Retrospective
Study Start Date : August 2005

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Non-small cell lung cancer

Exclusion Criteria:

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00173680

Contact: LINA LEE, MD,PhD 886-2-23123456 ext 5359

Department of Laboratory Medicine, Nation Taiwan University Hospital Recruiting
Taipei, Taiwan
Contact: LINA LEE, MD,PhD    886-2-23123456 ext 5359   
Sponsors and Collaborators
National Taiwan University Hospital
Principal Investigator: LINA LEE, MD,PhD Department of Labrotoary Medicine, National Taiwan University Hospital Taipei Identifier: NCT00173680     History of Changes
Other Study ID Numbers: 9461700826
First Posted: September 15, 2005    Key Record Dates
Last Update Posted: November 24, 2005
Last Verified: August 2005

Additional relevant MeSH terms:
Lung Neoplasms
Carcinoma, Non-Small-Cell Lung
Respiratory Tract Neoplasms
Thoracic Neoplasms
Neoplasms by Site
Lung Diseases
Respiratory Tract Diseases
Carcinoma, Bronchogenic
Bronchial Neoplasms