Saribal, DevrimKanber, Eyup MuratHocaoglu-Emre, Fatma SinemAkyolcu, Mehmet C.2024-03-132024-03-1320190268-35551758-1125https://doi.org/10.1177/0268355518814124https://hdl.handle.net/20.500.12662/3712Background Etiology of the varicose veins is still partly known. It has been proposed that varicose veins formation might be a cause of the oxidative stress and/or cause from genetical reasons. Method The levels of antioxidant defense system enzymes, superoxide dismutase, catalase, glutathione peroxidase, glutathione S-transferase, and an oxidative stress indicator, malondialdehyde, were measured in saphenous vein samples of varicose veins patients. Additionally, genetical polymorphism of glutathione S-transferase theta-1 has been studied. Result In this study, measurements revealed significant increase in catalase and malondialdehyde levels in the patient group, whereas superoxide dismutase and glutathione peroxidase and glutathione S-transferase enzyme activity and comparison of the null mutation frequency in the glutathione S-transferase theta-1 gene did not show a statistically significant difference. Conclusion We propose that the increase in catalase and malondialdehyde activities in our patient group may be related to each other. Increase in catalase levels, an antioxidant enzyme might be a compensatory response to the increase in malondialdehyde levels, an oxidative molecule.eninfo:eu-repo/semantics/closedAccessVaricose veinsgreat saphenous veinvascular surgeryArticle10.1177/02683555188141242-s2.0-85059472545413630463472Q340634WOS:000472183600006Q3