Artun Atac

University Medical Center Hamburg - Eppendorf, Hamburg, Hamburg, Germany

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Publications (7)12.42 Total impact

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    ABSTRACT: Background/Aim: Cyclin D1 gene (CCND1) has a G to A polymorphism at the splice donor site of exon 4, position 870. The A allele codes for a truncated variant, cyclin D1b, which may have higher transforming activity. Data regarding the predictive and prognostic value of the CCND1 G870A polymorphism in tumors are controversial. We aimed to examine this polymorphism in patients with oral carcinoma. Genotyping of CCND1 G870A was determined by means of direct sequencing in 83 patients with oral carcinomas and in 102 healthy controls. Association with clinical outcomes was evaluated statistically. We failed to find any significant association of CCND1 G870A with risk of oral carcinomas in this German population, with clinical and pathological features of the tumours or with overall survival of the patients. Our results suggest that CCND1 G870A has no, or only very limited, predictive and prognostic value for oral carcinoma.
    Anticancer research 01/2014; 34(1):235-238. · 1.87 Impact Factor
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    ABSTRACT: The aim of this prospective controlled study was to determine the validity of the mandibular cortical shape index (CI) on panoramic radiographs in distinguishing patients with osteoporosis as defined by the German Osteology Organization (Dachverbands der Deutschsprachigen Osteologischen Fachgesellschaften, DVO). The study group contained 50 patients (33 female, 17 male, mean age: 74.9 years), who had a high risk of osteoporosis. 50 young patients (33 female, 17 male, mean age: 37.9 years) with no anamnestic evidence of osteoporosis served as control. Three blinded observers evaluated panoramic views of the study and the control group in a mixed manner regarding the mandibular cortical shape index. The study group underwent bone mineral density measurement using dual energy X-ray absorptiometry and received a diagnosis according to the Organization's guidelines (normal, osteopenia, osteoporosis). The CI showed a high sensitivity of 72.2% and a high specificity of 93.9% with a highly significant predictive value (Chi-square = 22.96, p < 0.001), while the observer's agreement was moderate (kappa = 0.47). We concluded that patients with a cortical shape index of the category assessed as "severe" on non-standardised panoramic radiographs have a higher risk of suffering systemic osteoporosis. The CI in panoramic radiographs is a good screening tool, which could be implemented in the routine assessment of panoramic radiographs in elder patients.
    Journal of cranio-maxillo-facial surgery: official publication of the European Association for Cranio-Maxillo-Facial Surgery 01/2013; 41(7). DOI:10.1016/j.jcms.2012.11.044 · 2.60 Impact Factor
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    ABSTRACT: OBJECTIVES: The postoperative complications following the harvesting of the fibula through the lateral or medial access have increasingly become a subject of controversy in the literature. As the surgical access, amongst other factors, was important for us, we hoped to achieve a meaningful comparison of the consequences of the surgical access. MATERIALS AND METHODS: Forty-two patients were examined after the removal of a fibula flap using the medial (n = 21) and the lateral approach (n = 19). When using the lateral approach, a skin island was included in nine patients. To evaluate the operation results, we applied the clinical classification of the "American Orthopaedic Foot and Ankle Society": the AOFAS score. General health and changes to it were documented and evaluated using the SF-36 questionnaire. RESULTS: The comparison of the surgical approaches showed disadvantages significantly more often in the group of patients with lateral access: functional (36 vs. 32 %), neurological (30 vs. 63 %), and circulatory and wound healing problems (17 vs. 37 %). CONCLUSIONS: The medial access to the fibula is associated with lower long-term morbidity and higher patient satisfaction, not least on cosmetic. CLINICAL RELEVANCE: For this reason, when a purely osseous microvascular fibula graft is required, we prefer the medial access, particularly in female patients.
    Clinical Oral Investigations 03/2012; 16(4):1333. DOI:10.1007/s00784-012-0717-1 · 2.29 Impact Factor
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    Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons 05/2011; 69(10):2508-12. DOI:10.1016/j.joms.2011.02.032 · 1.28 Impact Factor
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    ABSTRACT: Esophageal cancer related gene 1 (ECRG1) is a novel candidate tumor suppressor gene in human esophageal squamous cells. Overexpression of ECRG1 protein inhibits tumor cell proliferation. Genetic polymorphisms in coding sequences of the gene may cause functional alterations of the gene product and be associated with higher cancer risk and disease phenotypes. A single nucleotide polymorphism (SNP) (Arg290Gln) found in the coding region of ECRG1 might play a role in susceptibility to esophageal squamous cell carcinoma. This study examined SNPs in ECRG1 in a similar tumor type (oral squamous cell carcinoma; OSCC) and investigated the relationship between SNPs in ECRG1 and the clinical outcome of patients with OSCC. DNA samples of 137 OSCC patients were analyzed for SNP genotypes Arg/Arg, Arg/Gln and Gln/Gln in the coding region (exon 8) of ECRG1. SNP genotypes Arg/Arg were found in 70 (51%), Arg/Gln in 60 (43%) and Gln/Gln in 7 (5%) patients. There was no significant association between genotypes and survival (p=0.77) or relapse free survival (p=0.32). The Gln/Gln genotype had the best survival (not significant) probably due to rare cases of SNP Gln/Gln genotype. Genotype Arg/Arg might be a potential negative prognostic marker in OSCC, but more studies with higher patient numbers are required.
    International Journal of Oral and Maxillofacial Surgery 05/2009; 38(7):779-84. DOI:10.1016/j.ijom.2009.02.021 · 1.36 Impact Factor
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    ABSTRACT: Short tandem repeat (STR) polymorphisms in exon 4 of esophageal cancer related gene 2 (ECRG2) are a prognostic marker for squamous cell carcinoma (SCC) of the esophagus. The aim of the present study was to correlate these STRs with clinical outcome of the similar tumor type oral squamous cell carcinoma (OSCC). DNA of 81 patients that underwent complete surgical resection of OSCC was analyzed for STRs TCA3/TCA3, TCA3/TCA4 and TCA4/TCA4 in exon 4 of ECRG2 by PCR, capillary electrophoresis and DNA sequencing. ECRG2 STR TCA3/TCA3 were found in 45 (56%), TCA3/TCA4 in 33 (41%) and TCA4/TCA4 in 3 (3%) patients. TCA3/TCA3 was significantly associated with reduced relapse-free survival of OSCC, compared with TCA3/TCA4 and TCA4/TCA4 genotypes (P<0.05; log-rank test). TCA3/TCA3 STR was independent prognostic factor determined by multivariate Cox regression analysis (p<0.05). STR polymorphism TCA3/TCA3 in exon 4 of ECRG2 is associated with poor relapse-free survival in surgically completely resected OSCC patients and might be a potential prognostic marker.
    Oral Oncology 03/2008; 44(2):143-7. DOI:10.1016/j.oraloncology.2007.01.013 · 3.03 Impact Factor
  • Oral Oncology Supplement 05/2007; 2(1):208-208. DOI:10.1016/S1744-7895(07)70535-7