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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.

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