2009 Vienna - European Society of Human Genetics
2009 Vienna - European Society of Human Genetics
2009 Vienna - European Society of Human Genetics
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Cancer genetics<br />
tient group in which 19 <strong>of</strong> them resulted in aa substitution. Our findings<br />
indicate that G8697A, G14905A, C15452A and A15607G mutations<br />
are frequent in bladder cancers (P< 0.05). These mutations are belong<br />
to mtDNA haplogroup T. No association was found between mtDNA<br />
mutations and the patients’ gender, tumor stage or grade, recurrence<br />
and progression.<br />
In conclusion, the high incidence <strong>of</strong> mtDNA mutations in bladder cancer<br />
suggests that mtDNA and mitochondria could play an important<br />
role in the process <strong>of</strong> carcinogenesis process. Especially, mtDNA haplogroup<br />
T may be important to detect the cancer risk. More extensive<br />
biochemical and molecular studies and further studies in larger groups<br />
are necessary to determine the pathological significance <strong>of</strong> these mutations.<br />
P06.014<br />
molecular genetic alterations and their predictive values in<br />
superficial bladder cancer.<br />
A. Y. Babayan 1,2,3 , S. V. Bashkatov 4 , O. B. Karyakin 4 , A. A. Teplov 5 , D. V. Zaletaev<br />
1,3 , M. V. Nemtsova 1,3 ;<br />
1 Sechenov Moscow Medical Academy, Moscow, Russian Federation, 2 Russian<br />
State Medical University, Moscow, Russian Federation, 3 Medical Genetic<br />
Research Centre, Moscow, Russian Federation, 4 Medical Radiology Research<br />
Centre, Obninsk, Russian Federation, 5 Moscow Herzen Oncological Research<br />
Institute, Moscow, Russian Federation.<br />
Conventional histopathologic and morphologic factors are widely used<br />
to predict poor prognosis in patients with superficial bladder cancer<br />
(BC) underwent transurethral resection. But this system is not able<br />
accurately predict the behavior <strong>of</strong> the most bladder tumors and need<br />
additional factors.<br />
Our purpose was to establish associations between some genetic alterations<br />
in respect to unfavorable clinical phenotype (recurrence rate,<br />
invasion, high grade) and to determine the prognostic significance <strong>of</strong><br />
these genetic alterations.<br />
We have studied 108 matched samples (blood and tumor tissue) from<br />
patients with superficial BC, <strong>of</strong> which 12 patients demonstrated recurrence<br />
within one year, and 10 samples from patients with invasive<br />
BC. The panel included loss <strong>of</strong> heterozygosity at 3p14, 9p21, 9q34,<br />
p53 locus, activating mutation in 7 exon FGFR3 and RASSF1A, p16,<br />
p14, RARb, CDH1 promoter hypermethylation. Methods: microsatellite<br />
analysis, SSCP and direct sequencing and methyl-sensitive PCR.<br />
Statistical analysis included comparison <strong>of</strong> the patients’ clinical groups<br />
by Fisher’s exact test, calculation <strong>of</strong> odds ratios and corresponding<br />
95% confidence intervals.<br />
Results: 9p21- locus deletions are significantly more frequent in primary<br />
tumors with high recurrence rate (within one year) (p=0.049.<br />
OR=8.70). FGFR3 mutations are associated with Ta stage (p=0.0042.<br />
OR=5.00). 3p14 locus deletions (p=0.042. OR=5.71), RARb (p=0.016.<br />
OR=3.91) and p16 (p=0.055. OR=4.17) promoter hypermethylation<br />
are associated with high grade tumors. P53 locus deletions (p=0.006.<br />
OR=8.10) and p16 hypermethylation (p=0.05. OR=4.09) are significantly<br />
more frequent in invasive bladder tumors than in superficial tumors.<br />
Conclusion. Revealed genetic alterations could be used as additional<br />
prognostic markers to predict tumor’s behavior more accurately.<br />
P06.015<br />
Diagnostic and prognostic molecular markers in brain tumors<br />
A. R. Lincesso 1 , D. Marchetti 1 , S. Pericotti 2 , D. Barachetti 1 , L. Pezzoli 1 , R. Merli<br />
3 , M. Iascone 1 ;<br />
1 Genetica Molecolare - USSD Lab. Genetica Medica, Ospedali Riuniti, Bergamo,<br />
Italy, 2 Anatomia Patologica, Ospedali Riuniti, Bergamo, Italy, 3 Neurochirurgia,<br />
Ospedali Riuniti, Bergamo, Italy.<br />
Malignant gliomas are associated with high morbidity and mortality.<br />
Despite optimal treatment, the survival is <strong>of</strong>ten very low. Recently,<br />
there have been advances in our understanding <strong>of</strong> the molecular<br />
pathogenesis <strong>of</strong> gliomas and progress in treating them. This work<br />
summarizes preliminary results <strong>of</strong> molecular markers routinely used<br />
to help diagnosis and management <strong>of</strong> these tumours in adults. Loss<br />
<strong>of</strong> heterozygosity (LOH) on 1p and 19q seem to be a predictor <strong>of</strong> good<br />
prognosis and chemosensitivity. Conversely, 10q LOH predicts rather<br />
poor outcome. Moreover, epigenetic silencing <strong>of</strong> the MGMT promoter<br />
predicts response to alkylating agents.<br />
We have analyzed 32 cases: 18 glioblastomas, 10 oligodendrocitomas<br />
and 4 astrocitomas. After DNA extraction from peripheral blood and<br />
microdissected-FFPE samples, we analyzed by microsatellite LOH on<br />
1p, 19q and 10q and the MGMT promoter by methylation-sensitive<br />
PCR. Two cases (1 astrocitoma and 1 glioblastoma) were not analyzable<br />
due to low quality <strong>of</strong> tumor DNA.<br />
All astrocitomas did not show LOH on chromosomes 1p, 19q and 10q.<br />
Among the 17 glioblastomas, two did not show LOH, three showed<br />
1p LOH, two 1p+19q LOH, one 1p+10q LOH, one 19q+10q LOH and<br />
eight 10q LOH. All oligodendrogliomas exhibited 1p+19q LOH. MGMT<br />
promoter resulted methylated in all oligodendrogliomas and astrocitomas,<br />
while among glioblastomas only 6 were methylated. As reported<br />
in literature, 1p and 19q LOH are hallmarks <strong>of</strong> oligodendrogliomas,<br />
while LOH do not seem to be associated to astrocitomas. These results<br />
confirm the correlation between histological diagnosis and genetic<br />
molecular markers; follow up on treatment response is underway.<br />
P06.016<br />
Polymorphisms in DNA BER genes XRcc1 and PARP1 increase<br />
the risk <strong>of</strong> adult brain tumors<br />
G. Kanigur 1 , E. Yosunkaya 2 , B. Küçükyürük 3 , H. Biçeroğlu 3 , M. Uzan 3 , Ç.<br />
Gürel 1 , &. Onaran 1 ;<br />
1 Department <strong>of</strong> Medical Biology, Cerrahpasa Medical School, Istanbul University,<br />
TURKEY, İstanbul, Turkey, 2 Department <strong>of</strong> Medical <strong>Genetics</strong>, Cerrahpasa<br />
Medical School, Istanbul University, TURKEY, İstanbul, Turkey, 3 Department<br />
<strong>of</strong> Neurosurgery, Cerrahpasa Medical School, Istanbul University, İstanbul,<br />
Turkey.<br />
Cancer development is a multi-step process, in which polygenetic and<br />
environmental factors play important roles. Allelic polymorphisms <strong>of</strong><br />
genes that code for DNA repair enzymes could also determine genetic<br />
susceptibility or resistance to cancer in most instances. XRCC1<br />
and PARP1 are two important proteins in base excision repair. In this<br />
hospital-based case-control study, consisted <strong>of</strong> 137 patients with primary<br />
brain tumors and 244 cancer-free control subjects, we sought<br />
to determine possible associations between XRCC1 Arg399Gln and<br />
PARP1 Val762Ala polymorphisms and primary brain tumors. We<br />
also searched for any possible relation between the tumor grade and<br />
these polymorphisms. The results indicated a significant association<br />
between the occurrence <strong>of</strong> primary brain tumor and the existence <strong>of</strong><br />
XRCC1 Arg399Gln and PARP1 Val762Ala polymorphisms (OR: 2,113;<br />
95% CI: 1,069-4,176; p=0.041 and OR: 3,720; 95% CI: 1,673-8,273;<br />
p=0.001, respectively). However, there was no statistically significant<br />
relationship between the tumor grade and the polymorphisms studied.<br />
We conclude that XRCC1 Arg399Gln and PARP1 Val762Ala polymorphisms<br />
might play role in the initial stages but have no effect on the<br />
progression <strong>of</strong> brain tumor development.<br />
P06.017<br />
cancer genes mutation testing - an improved sequencing<br />
workflow for quality-assured, clinical-grade results using<br />
improved technology capillary electrophoresis<br />
T. Schäfer, K. O. Wesche;<br />
Applied Biosystems GmbH, Darmstadt, Germany.<br />
It was found that the range <strong>of</strong> mutations that can drive cancer growth<br />
could be much wider than initially expected. An international research<br />
effort, the Cancer Genome Project, has identified around 120 genes<br />
that may contain mutations promoting the disease. Moreover, in the<br />
recent years it has been demonstrated that cancer gene mutations can<br />
not only report about cancer predisposition like in BRCA1 and BRCA2<br />
genes but that they can also serve as biomarkers for therapy decisions<br />
and so in clinical practice mutations in the genes KRAS, EGFR and<br />
more recently BRAF are being used for that purpose. This has brought<br />
cancer gene mutation analysis from a research study to a clinical management<br />
practice. For this reason also the needs for the technology<br />
capable <strong>of</strong> performing genetic analysis changed from high productivity<br />
features to an easy to use technology. Here we describe the results<br />
<strong>of</strong> independent collaborative studies to develop improved sequencing<br />
workflows on several selected cancer genes. These protocols take advantage<br />
<strong>of</strong> new reagents for better sensitivity and the latest generation<br />
capillary electrophoresis instruments, easy to use and with new level<br />
<strong>of</strong> data quality. Quality control features built in this new technology will<br />
<strong>of</strong>fer new solutions to the clinical laboratory for obtaining results with<br />
the highest level <strong>of</strong> reliability and quality.