Importance of polymorphisms in NF-κB1 and NF-κBIα genes for melanoma risk, clinicopathological features and tumor progression in Swedish melanoma patients
- 171 Downloads
Importance of polymorphisms in NF-κB1 and NF-κBIα genes for melanoma risk, clinicopathological features and tumor progression is analyzed in Swedish melanoma patients.
Patients and methods
Functional polymorphisms of NF-κB1 and NF-κBIα genes were examined in 185 melanoma patients and 438 tumor-free individuals. Associations of the polymorphisms with melanoma risk, age and pigment phenotypes of the patients and clinicopathological tumor characteristics were analyzed. DNAs were isolated from mononuclear cells of venous blood. Polymorphisms of the genes were genotyped by a PCR-RFLP technique, and transcription level of NF-κBIα was examined by a quantitative real-time reverse transcription PCR.
Both ATTG insertion polymorphism of NF-κB1 and A to G polymorphism of NF-κBIα genes were correlated with melanoma risk, especially, in a combination of ATTG 2 /ATTGT2 and GG. NF-κB1 ATTG2/ATTG2 and NF-κBIα GG genotypes were associated with male gender and age >65 years (at diagnosis). Patients with ATTG1/ATTG1 genotype had thinner tumors and lower Clark levels at diagnosis. Frequency of ATTG1/ATTG1 genotype was higher in patients with melanomas on intermittently sun-exposed pattern of the body and NF-κBIα GG was more frequent in the patients with melanomas at rarely exposed sites. There were no differences in the gene transcription level between patients with different NF-κBIα genotypes.
NF-κB1 and NF-κBIα genes might be susceptible genes for melanoma risk and functional polymorphisms of these genes might be biological predictors for melanoma progression.
KeywordsPolymorphisms NF-κB1 NF-κBIα Melanoma risk Clinicopathological features Phenotypes
The authors are grateful to Mona-Lisa Sandh from the Department of Dermatology, Linköping University Hospital, Drs. Kenneth Lagmo and Eva Niklasson from the Dermatology Out-patient Clinic, Linköping, and the melanoma patients who participated in this study. The study was supported by Edward Welander Finsen Foundation, Cancer and Allergy Foundation and Research Council in the South-East of Sweden
- Stierner U, Augustsson A et al (1991) Regional distribution of common and dysplastic naevi in relation to melanoma site and sun exposure. A case-control study. Melanoma Res 1(5–6):367–375Google Scholar