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The control group consisted of 99 subjects. Exclusion criteria for controls were malignancies and immunopathological disorders. Mean age was 68?years (range 37�C91) with a 45/54 male/female sex ratio. All patients and controls gave informed consent and the study was approved by the national scientific ethical committee (ETT TUKEB 12236-45/2004-1018EKU). Ethylenediaminetetraacetic acid (EDTA)-anticoagulated blood samples were collected from each patient and control, and genomic DNA was extracted from white blood cells by the salting-out procedure. The ?174G/C polymorphism of the IL6 gene http://www.selleckchem.com/products/VX-770.html (rs1800795) was analysed with polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and the Asp358Ala single nucleotide polymorphism (SNP) of the IL6R gene (A>C, rs2228145, previously: rs8192284) was genotyped using a TaqMan SNP Genotyping Assay (Life Technologies, Carlsbad, CA, USA) as described previously (Aladzsity et?al, 2009). Deviation from Hardy�CWeinberg equilibrium was evaluated and association analysis was performed by chi-square test using the graphpad prism v.4.0 and Statistical Package for the Social Sciences (spss) v.13.0 software. All tests were two-tailed and P? http://www.selleckchem.com/products/ch5424802.html patients and controls in the frequency of ?174G/C polymorphism of the IL6 gene (Table?1). http://www.selleck.cn/products/Verteporfin(Visudyne).html For the Asp358Ala SNP of the IL6R gene, the AA genotype and A allele was found to be less frequent in mastocytosis patients when compared to controls (P?=?0��0317 and P?=?0��0229, respectively) (Table?1). The odds ratio (OR) for developing mastocytosis of AA genotype carriers was 0��4019 [95% confidence interval (CI)?=?0��2013�C0��8021; P?=?0��0088], whereas C allele carriers (AC?+?CC) had a higher risk (OR?=?2��488; 95%CI?=?1��247�C4��967; P?=?0��0088) for the disease. Analysis of the combined effect of the two studied polymorphisms showed that the AA genotype of IL6R polymorphism, together with the G allele of IL6 polymorphism, were less frequent in mastocytosis patients than in controls (P?=?0��00026) with an OR of 0��2348 (95%CI?=?0��1043�C0��5289; P?=?0��0003) (Fig?1). The aim of the present study was to evaluate the role of two polymorphisms influencing circulating IL6 level in heritable mastocytosis risk by comparing mastocytosis patients and controls. Analysis of the IL6R Asp358Ala polymorphism showed that frequencies of the A allele and the AA genotype were significantly lower in mastocytosis patients in comparison to healthy controls.