Abstract
The objective of this study is to compare serum levels of FKN and SFRP-4 in patients with normal glucose tolerance (NGT), impaired glucose tolerance (IGT), and type 2 diabetes mellitus (T2DM). A total of 152 patients presented to the endocrinology outpatient clinic of our hospital were included in the study. Eighty-two patients with a history of T2DM were assigned to the T2DM group. IGT (n = 34) and NGT (n = 36) groups included the patients who received oral glucose tolerance test outcomes. Serum FKN levels were significantly higher in the IGT and T2DM groups compared to the NGT group (p< 0.001 and p < 0.001, respectively). Serum SFRP-4 levels were significantly higher in the T2DM group compared to the IGT and NGT groups (p = 0.001 and p = 0.004, respectively). A significant correlation was observed between FKN and fasting glucose levels. SFRP-4 was significantly correlated with fasting glucose, HbA1c, and triglyceride levels. To our knowledge, increased FKN levels in patients with IGT were demonstrated for the first time in this study. The results of our study support the opinion that FKN and SFRP-4 may contribute to the pathogenesis of T2DM (Tab. 1, Fig. 3, Ref. 23).
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