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Objectives: The etiology of multiple myeloma (MM) is not exactly known. This study investigated the role of thiol/disulfide homeostasis in the etiopathogenesis of MM.

Methods: Some 50 patients with MM (aged 39–84 years) and 50 sex-matched healthy volunteer controls (aged 50–91 years) participated in this study. Venous blood samples were collected, and levels of native thiols, total thiols, and disulfide were measured.

Results: Native and total thiol levels in the control group were determined to be higher than in the study and patient groups (P<0.001). Disulfide levels were found to be higher in the control group than in the study group and higher in newly diagnosed patients than in outpatients who were undergoing treatment (P=0.002). The ratios of thiol levels were found to be similar in both the study and control groups (P>0.05).

Discussion: The results of the study show that although there was a decrease in the …