Turkiye Klinikleri Journal of Medical Sciences

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Baş-Boyun Kanserli Hastalarda Siklin D1 G870A Polimorfizminin İncelenmesi
Analysis of Cyclin D1 G870A Polymorphism in Patients with Head and Neck Cancers
Semra DEMOKANa, Yusufhan SÜOĞLUb, Murat ULUSANb, Nejat DALAYa
aTemel Onkoloji AD, İstanbul Üniversitesi Onkoloji Enstitüsü, bKulak Burun Boğaz Hastalıkları AD, İstanbul Üniversitesi İstanbul Tıp Fakültesi, İstanbul
Turkiye Klinikleri J Med Sci. 2011;31(6):1435-41
doi: 10.5336/medsci.2010-20799
Article Language: TR
Full Text
ÖZET
Amaç: Baş-boyun kanserleri (HNC) dünyada en yaygın kanserler arasında altıncı sırada yer almaktadır. Yapılan çalışmalar genetik yatkınlığın bu kansere yakalanma riski açısından önemli bir rol oynadığını göstermekte, hücre siklusunun düzenlenmesinde görev alan Siklin D1 (CCND1) genindeki bir polimorfizmin genetik yatkınlığın altında yatan neden olduğu düşünülmektedir. Literatürde HNC'de CCND1 gen polimorfizmiyle yapılmış az sayıda çalışma bulunmaktadır. Türk HNC hastalarında bu polimorfizmi inceleyen çalışma ise mevcut değildir. Çalışmamızda, CCND1 genindeki G870A polimorfizmi incelenmiş ve allel ve genotip dağılımları ile klinik parametreler arasındaki ilişki değerlendirilmiştir. Gereç ve Yöntemler: Çalışma kapsamında, baş-boyun kanserli 95 hastanın periferik kan örnekleri ile sağlıklı 40 kişiye ait periferik kan örnekleri incelenmiştir. Toplanan örneklerden DNA elde edildikten sonra CCND1 genine özgü polimorfik bölge polimeraz zincir reaksiyonu ile çoğaltılmış, sonra uygun restriksiyon enzimi kullanılarak kesilmiş ve sonuçlar video-gel dökümantasyon sistemi yardımıyla değerlendirilmiştir. Polimorfik dağılımlar, Finetti vaka-kontrol istatistik programı kullanılarak sağlıklı kişilerdeki allel frekansları ile kıyaslanmış ve 2 (Ki-kare) testleri ile hastaların klinik ve patolojik bulgularıyla ilişkileri araştırılmıştır. Bulgular: Baş-boyun kanserli hastalarla kontrol grubu arasında allel ve genotip dağılımları açısından anlamlı bir fark gözlenmezken, yassı epitel hücreli (YEH)-dışı hastalarda GA heterozigot genotipi ile kombine GA + AA genotipleri düşük hastalık riskiyle ilişkili bulunmuştur. Ayrıca YEH kanser grubunda YEH-dışı hastalara oranla A alleline anlamlı derecede sık rastlanmıştır. Sonuç: Baş-boyun karsinogenezinde tümörün histolojisine göre CCND1 geninin değişik varyantlarının etkili olabileceği düşünülmektedir.

Anahtar Kelimeler: Çok biçimlilik, tek nükleotid; siklin D1, baş ve boyun tümörleri
ABSTRACT
Objective: Head and neck cancer (HNC) is the sixth leading cancer among the most frequent cancers worldwide. Studies indicate that genetic predisposition plays an important role for HNC risk and a polymorphism in cyclin D1 (CCND1) gene taking part in regulation of cell cycle is considered to be the underlying cause of genetic predisposition. A few studies are available in literature on CCND1 gene polymorphism in HNC. No studies are available in literature investigating this polymorphism in Turkish HNC patients. In our study, G870A polymorphism in CCND1 gene was analysed and the relationship between allele and genotype distributions and clinical parameters was evaluated. Material and Methods: Peripheral blood samples of 95 HNC patients and 40 healthy controls were analysed as part of the study. CCND1 gene-specific polymorphic region was reproduced with polymerase chain reaction after DNA was obtained from the collected samples, afterwards it was cut using a proper restriction enzyme and results were assessed with video-gel documentation system. Polymorphic distributions were compared with allele frequencies of healthy individuals using Finetti case-control statistical program and relationships with clinical and pathologic findings of the patients were analysed using 2 (Chi-square) tests. Results: While a significant difference was not found between head and neck cancer patients and control group in terms of allele and genotype distributions, GA heterozygot genotype and combined GA + AA genotypes were found associated with low disease risk in patient with non-squamous cell cancer (NSCC). Additionally, A allele was detected significantly frequent in SCC group compared to NCCC patients. Conclusion: Different variants of CCND1 gene are considered to be effective in head and neck carcinogenesis according to tumor histology.

Keywords: Polymorphism, single nucleotide; cyclin D1; head and neck neoplas

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