Abstract
Background
The immune system has been implicated in the pathophysiology of cutaneous squamous cell carcinoma (cSCC) as evidenced by the substantially increased risk of cSCC in immunosuppressed individuals. Associations between cSCC risk and single nucleotide polymorphisms (SNPs) in the HLA region have been identified by genome-wide association studies (GWAS). The translation of the associated HLA SNPs to structural amino acids changes in HLA molecules has not been previously elucidated.
Methods
Using data from a GWAS that included 7238 cSCC cases and 56,961 controls of non-Hispanic white ancestry, we imputed classical alleles and corresponding amino acid changes in HLA genes. Logistic regression models were used to examine associations between cSCC risk and genotyped or imputed SNPs, classical HLA alleles, and amino acid changes.
Results
Among the genotyped SNPs, cSCC risk was associated with rs28535317 (OR = 1.20, p = 9.88 × 10− 11) corresponding to an amino-acid change from phenylalanine to leucine at codon 26 of HLA-DRB1 (OR = 1.17, p = 2.48 × 10− 10). An additional independent association was observed for a threonine to isoleucine change at codon 107 of HLA-DQA1 (OR = 1.14, p = 2.34 × 10− 9). Among the classical HLA alleles, cSCC was associated with DRB1*01 (OR = 1.18, p = 5.86 × 10− 10). Conditional analyses revealed additional independent cSCC associations with DQA1*05:01 and DQA1*05:05. Extended haplotype analysis was used to complement the imputed haplotypes, which identified three extended haplotypes in the HLA-DR and HLA-DQ regions.
Conclusions
Associations with specific HLA-DR and -DQ alleles are likely to explain previously observed GWAS signals in the HLA region associated with cSCC risk.
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Abbreviations
- cSCC:
-
Cutaneous squamous cell carcinoma
- GERA:
-
Genetic Epidemiology Research in Adult Health and Aging
- GWAS:
-
Genome-wide association study
- HLA:
-
Human leukocyte antigen
- KPNC:
-
Kaiser Permanente Northern California
- LD:
-
Linkage disequilibrium
- MAF:
-
Minor allele frequency
- OR:
-
Odds ratio
- SNP:
-
Single nucleotide polymorphism
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Funding
This work was supported by a grant from the National Cancer Institute at the National Institutes of Health (Grant number R01CA166672).
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WW: drafting and revisions to manuscript, acquisition of data, and/or analysis and interpretation of results. HMO: drafting and revisions to manuscript, acquisition of data, and/or analysis and interpretation of results. ASW: conception and design, revisions to manuscript. SD: interpretation of results and revisions to manuscript. NMI: revisions to manuscsript. EJ: interpretation of results and revisions to manuscript. EM: conception and design, data analysis, revisions to manuscript. MMA: conception, funding, data acquisition, revisions to manuscript.
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Conflict of interest
Dr. Asgari has received institutional research funding (role: Principal Investigator) from Valeant Pharmaceuticals for an unrelated topic (atopic dermatitis). All other authors declare that they have no conflict of interest.
Ethical approval and ethical standards
This study was approved by the Kaiser Permanente Northern California Institutional review board (approval number CN-12MAsga-03-H) and was conducted in accordance with the Helsinki declaration.
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Informed consent was waived.
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Emmanuel Mignot and Maryam M. Asgari equally contributing as last author
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Wang, W., Ollila, H.M., Whittemore, A.S. et al. Genetic variants in the HLA class II region associated with risk of cutaneous squamous cell carcinoma. Cancer Immunol Immunother 67, 1123–1133 (2018). https://doi.org/10.1007/s00262-018-2168-2
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DOI: https://doi.org/10.1007/s00262-018-2168-2