Serum Periostin as a Complementary Biomarker of Frailty in Type 2 Diabetes: A Pilot Study Using the FRAIL Scale.

Frailty is a multidimensional syndrome of reduced physiological reserve that is particularly prevalent in individuals with type 2 diabetes. Identifying objective biochemical markers to complement clinical screening tools, such as the FRAIL scale, is an increasingly important unmet need. Periostin, a matricellular protein involved in tissue remodeling, bone metabolism, and chronic complications of diabetes, has emerged as a potential candidate. In this cross-sectional study of 137 adults with type 2 diabetes (65 ± 8 years), participants were classified as robust, pre-frail, or frail according to FRAIL scores. Frailty correlated positively with age (p < 0.001), BMI (p = 0.006), waist circumference (p = 0.01), and diabetes duration (p = 0.040), and negatively with TBS (p = 0.001), HDL-c (p = 0.040), and eGFR (p = 0.009). A stronger positive correlation was observed with serum periostin (p < 0.001). Frail individuals showed higher periostin levels than pre-frail (p = 0.006) and robust participants (p = 0.008), independent of age. Periostin demonstrated moderate discriminatory capacity for frailty status (AUC = 0.710; p < 0.001), while adding periostin to clinical variables resulted in a numerical increase in overall model discrimination (AUC = 0.900 vs. 0.858). A threshold of >1307 pmol/L yielded 77.8% sensitivity and 66.7% specificity. These preliminary findings indicate that periostin is significantly associated with frailty in type 2 diabetes and may represent a complementary biochemical biomarker of frailty status, warranting further validation in longitudinal studies.