FGF23 and bile duct papillary neoplasm: However, in contrast to FGF-23, plasma levels of these cytokines showed no correlation with quantitative and semi-quantitative SMI-assessed IPN (p=0,482, r=-0.136, p=0.370, r=-0.173 and p=0,723, r=0.069, p= 0.765, r=0.058, respectively).