Psoriasis is a common, chronic, and autoimmune skin disease in which dysregulation of immune cells, particularly T cells, is thought to play an important role in the pathogenesis. Cytotoxic T lymphocyte antigen-4 (CTLA-4) expressed only on activated T cells is an immunoregulatory molecule and plays a role in the pathogenesis of autoimmune disorders. We aimed to determine whether CTLA-4 gene polymorphisms are associated with development and/or clinical features of psoriasis vulgaris (Pv). Genotyping of SNPs (−318C>T, +49A>G, and CT60A>G) in CTLA-4 gene was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 103 Pv patients and 102 controls. No statistically significant associations were detected in any of the investigated genetic models for the −318C>T polymorphism. The genotype distributions of +49A>G and CT60A>G were associated with Pv development. In haplotype analysis, while frequency of CAA haplotype was significantly higher in the control group, frequencies of CGG and CAG haplotype were significantly higher among the patients. However, all of CTLA-4 polymorphisms and haplotypes do not have an effect on severity and onset age of Pv. In conclusion, the +49A>G and CT60A>G polymorphisms may be risk factors for Pv development. Furthermore, CGG and CAG haplotypes may contribute to Pv development, while CAA haplotype may be protective against Pv.

Background: Blood transfusion is a life-saving but high-risk procedure in various medical conditions as it is not a simple fluid infusion but an organ transplant. Although blood transfusions save lives, they may cause serious, life-threatening reactions. Nowadays, the number of reactions has decreased significantly with the reduction of leucocyte content of blood products or their irradiation. Materials and Method: A total of 5582 patients who received irradiated blood products in our hospital between 14/08/2020 and 17/02/2023 were included in the present study. Erythrocyte suspension, platelet apheresis, and pooled platelet suspension were irradiated at doses of 25–30 Gy. Results: A total of 5582 blood products including 4990 erythrocyte suspensions, 282 pooled platelet suspensions, and 310 platelet apheresis were irradiated in the present study. No transfusion-associated Graft Versus Host Disease was identified in any patient included in the present study and there were only mild allergic reactions and febrile non-hemolytic transfusion reactions. Conclusions: Based on the data obtained here from, it was concluded that irradiation of blood products can prevent the highly fatal transfusion-related Graft Versus Host Disease.

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