Arsenic Methylation Enzymes, Cigarette Metabolites, DNA Repair Enzymes, Inflammatory Factors and Urothelial Carcinoma

March 2, 2009 updated by: National Taiwan University Hospital

Arsenic Methylation, Cigarette Smoking Exposure, Individual DNA Susceptibility Factors and Urothelial Carcinoma

  1. To investigate the relationship between arsenic methylation enzymes (AS3MT, PNP,GSTO1, and GSTO2) genetic polymorphism and UC risk.
  2. To explore the relationship between cigarettes metabolites (NNK, NNAL, HBA, NNAL-Gluc, O6-Methylguanine, and N7-Methylguanine) and UC risk.
  3. To examine the relationship between cigarette metabolic enzymes (CYP2A6, CYP2A13, and UGT2B7) genetic polymorphism and UC risk.
  4. To elucidate the relationship between DNA repair enzymes (MGMT, XPD, XRCC1, and XRCC3) gene polymorphism and 8-OHdG or between DNA repair enzymes and UC risk.
  5. To examine relationship between COX-2 (-1195G/A、-765G/C 和8473C/T), IL-6, IL-8, and TNF-α gene polymorphism and 8-OHdG or between COX-2, IL-6, IL-8, and TNF-α gene polymorphism and UC risk.
  6. To examine the risk factors of the environment-environment, gene-environment, and gene-gene interaction on the risk of UC.

Study Overview

Status

Unknown

Conditions

Detailed Description

Urothelial carcinoma (UC) arises exclusively from the urothelium including the renal pelvis,ureter, bladder and urethra, with bladder transitional cell carcinoma (TCC) being the most common form. Arsenic is a well-established human carcinogen of the skin and lung. Recent studies have well documented that the long-term exposure to inorganic arsenic through ingestion and inhalation is associated with an increased risk of bladder cancer, especially TCC.

However, the carcinogenic mechanism of arsenic-induced UC is still unclear. Recently our study found that cigarette smoking interacts with the urinary arsenic profile in modifying the UC risk. In addition, we also found that DNA damage marker 8-hydroxydeoxyguanine (8-OHdG) levels significantly higher in UC patients compared to healthy controls. The mechanism of the interaction between arsenic methylation and cigarette on UC risk is unknown. In addition, whether 8-OHdG is related to DNA repair enzymes or to inflammatory factors or not does need to explore, therefore the specific aims of this project are:

  1. To investigate the relationship between arsenic methylation enzymes (AS3MT, PNP, GSTO1, and GSTO2) genetic polymorphism and UC risk.
  2. To explore the relationship between cigarettes metabolites (NNK, NNAL, HBA, NNAL-Gluc, O6-Methylguanine, and N7-Methylguanine) and UC risk.
  3. To examine the relationship between cigarette metabolic enzymes (CYP2A6, CYP2A13, and UGT2B7) genetic polymorphism and UC risk.
  4. To elucidate the relationship between DNA repair enzymes (MGMT, XPD, XRCC1, and XRCC3) gene polymorphism and 8-OHdG or between DNA repair enzymes and UC risk.
  5. To examine relationship between COX-2 (-1195G/A、-765G/C 和8473C/T), IL-6, IL-8, and TNF-α gene polymorphism and 8-OHdG or between COX-2, IL-6, IL-8, and TNF-α gene polymorphism and UC risk.
  6. To examine the risk factors of the environment-environment, gene-environment, and gene-gene interaction on the risk of UC.

Study Type

Observational

Enrollment (Anticipated)

420

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Taiwan
      • Taipei, Taiwan, 10002
        • Recruiting
        • Department of Urology/National Taiwan University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

project recruited 420 UC patients in Taiwan University Hospital

Description

Inclusion Criteria:

  • project recruited 420 UC patients in Taiwan University Hospital

Exclusion Criteria:

-

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Taiwan University Hospital

Investigators

  • Principal Investigator: Yeong-Shiau Pu, M.D.PhD., National Taiwan University Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

August 1, 2008

Primary Completion (Anticipated)

July 1, 2011

Study Registration Dates

First Submitted

March 1, 2009

First Submitted That Met QC Criteria

March 2, 2009

First Posted (Estimate)

March 3, 2009

Study Record Updates

Last Update Posted (Estimate)

March 3, 2009

Last Update Submitted That Met QC Criteria

March 2, 2009

Last Verified

March 1, 2009

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 200809019R

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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