The median level of periostin in patients with MCDK (groups A and B) was 204.4 ± 168.2 [IQR: 34.9, 363.4] ng/mL and 141.1 ± 129.0 [IQR: 30.3, 276.9] ng/mL in group C, respectively. Here, POSTN is linked to multicystic dysplastic kidney.