TLR4 Polymorphisms and Risk of Skin Cancer

Study Overview
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Brief Summary
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Toll-like receptors (TLRs) play a key role in the innate immune system. Toll-like receptor-4 (TLR4) in particular, appears to play a role in susceptibility to cancer. Of 44 identified SNPs (small nucleotide polymorphisms) in TLR4, the most common is an A-G substitution at nucleotide position +896, downstream of the cDNA start codon, a missense mutation which leads to an amino acid substitution Asp299Gly in the third exon of the TLR4 gene. Pre-clinical studies from our laboratory have shown an association of TLR4 with ultraviolet radiation induced skin cancer. Hence, in this study we will assess the pattern of TLR4 polymorphisms and susceptibility to skin cancer.

Detailed Description
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Toll-like receptors (TLRs) play a key role in the innate immune system. Toll-like receptors generally, and TLR4 in particular, appear to play a role in cancer susceptibility as well as tumor immunosuppression and stromal invasion. Of 44 identified SNPs (small nucleotide polymorphisms) in TLR4, the most common is an A-G substitution at nucleotide position +896, downstream of the cDNA start codon, a missense mutation which leads to an amino acid substitution Asp299Gly in the third exon of the TLR4 gene, and which was later shown to co-segregate with SNP Thr399Ile-also in the third exon of TLR4.1 This SNP, present in 10% of the general population, has been found associated with gastric cancer, prostate cancer, and nasopharyngeal cancer.2-4 Pre-clinical studies from our laboratory have shown an association of TLR4 with ultraviolet radiation induced skin cancer. Hence, in this study we will assess the pattern of TLR4 polymorphisms and susceptibility to skin cancer.

Official Title
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TLR4 Polymorphisms and Predisposition for Skin Cancer Development

Conditions
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Skin Cancer

Intervention / Treatment
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* Diagnostic Test: Detection of single nucleotide polymorphisms (SNP)


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Male or female over the age of 50 Fitzpatrick skin type I-IV Exclusion Criteria: Tumor types other than basal cell carcinoma, squamous cell carcinoma and melanoma Chronic immunosuppression due to transplant antirejection regimen or HIV/AIDS Nevoid basal cell carcinoma syndrome, Cowden's syndrome, xeroderma pigmentosum or other syndrome with skin-cancer predisposition Known exposure to arsenic or ionizing radiation

Ages Eligible for Study
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Minimum Age: 50 Years
Maximum Age: 99 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Intervention/Treatment |
| --- |
|Diagnostic Test: Detection of single nucleotide polymorphisms (SNP)|Asp299Gly SNP in the third exon of the TLR4 gene will be detected in blood|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| single nucleotide polymorphism | TLR4 SNP Asp299Gly | once during the course of study | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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single nucleotide polymorphisms, Toll-like receptor-4