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    <ns1:title language="sr">Povezanost polimorfizama VDR, CYP27B1 i CYP24A1 gena sa etiološkim faktorima i ishodom bolesti kod pacijenata sa oralnim skvamocelularnim karcinomom </ns1:title>
    <ns2:subtitle language="sr">doktorska disertacija</ns2:subtitle>
    <ns2:alt_title language="en">Association of polymorphisms in VDR, CYP27B1 and CYP24A1 genes with etiological factors and disease outcomes in patients with oral squamous cell carcinoma : doctoral dissertation</ns2:alt_title>
    <ns1:language>sr</ns1:language>
    <ns1:description language="sr">Oralni skvamocelularni karcinomi (Oral Squamous Cell Carcinoma- OSCC) se
karakterišu visokom stopom mortaliteta, lošom prognozom i porastom incidence
među osobama mlađe populacije. I pored uloženih napora na polju prevencije,
petogodišnje preživljavanje je ostalo nepromenjeno poslednjih nekoliko decenija,
što nameće potrebu za nove, molekularne vidove karakterizacije oralnog
karcinoma. Poznati faktori rizika za nastanak oralnog karcinoma su: pušenje i
žvakanje duvana, konzumiranja alkohola, loša oralna higijena i infekcije
visokorizičnim tipovima humanog papiloma virusa. Činjenica da samo izvesni
procenat osoba izloženih navedenim faktorima rizika zaista i razvije OSCC, ukazuje
na značaj genetičke osnove u procesu oralne kancerogeneze.
Mnogobrojnim studijama je pokazano da vitamin D ima antikancerogeni
efekat, koji se ogleda u zaustavljanju ćelijskog ciklusa, inicijaciji ćelijske
diferencijacije, indukciji apoptoze, sprečavanju invazije malignih ćelija i
antiangiogenetskom dejstvu. Vitamin D ispoljava svoju fiziološki aktivnu ulogu
nakon vezivanja za receptor za vitamin D (engl. Vitamin D Receptor- VDR) koji je
kodiran VDR genom. U VDR genu je identifikovan veliki broj polimorfizama
nukleotidne sekvence (engl. Single Nucleotide Polymorphisms- SNP), od kojih
samo mali broj ima funkcionalni efekat. U metabolizam vitamina D su uključeni
članovi velike familije proteina citohroma P450 i to: 1α-hidroksilaza uključena u
proces anabolizma (kodirana CYP27B1 genom), odnosno 24-hidroksilaza koja ima
ulogu u katabolizmu (kodirana CYP24A1 genom). Obzirom na značaj proučavanja
SNP-ova u genetičkim studijama asocijacije, postavlja se pitanje da li postojanje
izvesnih genetičkih varijanti u genima uključenim u funkcionisanje i metabolizam
vitamina D može biti asocirano sa rizikom nastanka oralnog karcinoma, kliničko
patološkim karakteristikama i preživljavanjem pacijenata...</ns1:description>
    <ns1:description language="en">Oral Squamous Cell Carcinoma (OSCC) is characterized with a high
mortality, low survival rate and rising incidences among members of younger age
groups. Despite efforts in prevention, the survival rate remains unchanged for the
last few decades, which indicates the need for oral cancer molecular
characterization. The well-known risk factors are tobacco smoking and chewing,
alcohol consumption, poor oral hygiene and infection with high risk human
papilloma virus types. The fact that only a small percentage of people exposed to
the risk factors really develops OSCC indicates the importance of genetic
background in the process of oral cancerogenesis.
Numerous studies have demonstrated the anticancerogen effects of vitamin
D, which is reflected in cell cycle arrest, induction of cell differentiation, apoptosis
induction, inhibition of malignant cell invasion and antiangiogenic effect. Vitamin D
exerts it’s physiological function after binding to the Vitamin D Receptor (VDR),
which is encoded by the VDR gene. A great number of Single Nucleotide
Polymorphisms (SNPs) have been identified in the VDR gene, among which a small
number have functional effects. Members of the huge protein cytochrome P450
family are involved in vitamin D metabolism: 1α-hydroxylase is involved in
anabolism (encoded by the CYP27B1 gene) and 24-hydroxylase is involved in
catabolism (encoded by the CYP24A1 gene). Since SNPs investigation is of great
importance in the genetic association studies, it is interesting to consider whether
genetic variants in genes, involved in vitamin D functioning and metabolism, could
be associated with oral cancer risk, clinicopathological characteristics and patient
survival...</ns1:description>
    <ns1:description language="sr">Biologija - Genetika / Biology - Genetics 
Datum odbrane : 5.11.2012</ns1:description>
    <ns1:keyword language="sr">oralni skvamocelularni karcinom, polimorfizmi nukleotidne sekvence, VDR gen, CYP27B1 gen, CYP24A1 gen</ns1:keyword>
    <ns1:coverage language="en">oral squamocellular carcinoma single nucleotide polymorphism, VDR gene, CYP27B1 gene, CYP24A1 gene</ns1:coverage>
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    <ns7:description language="sr">Biologija - Genetika / Biology - Genetics
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