Growth differentiation factor 15 as a predictor of adverse renal outcomes in patients with immunoglobulin A nephropathy.

BACKGROUND: Growth differentiation factor 15 (GDF 15) has recently been reported as a useful prognostic marker in patients with chronic inflammatory disease and heart disease.

AIM: To evaluate the role of GDF 15 as a potential prognostic predictor of renal outcome in immunoglobulin A nephropathy (IgAN).

METHODS: In total, 212 patients in the Chungnam National Hospital glomerulonephritis cohort, who were diagnosed as biopsy-proven IgAN between March 2010 and June 2014, were included. GDF Fifteen was analysed by the enzyme-linked immunosorbent assay. Cut-off values of the GDF 15 and the hazard ratio of it resulting in haemodialysis within 2 years were analysed.

RESULTS: The level of serum GDF 15 was negatively correlated with the initial eGFR. A serum GDF 15 level of more than 496.32 pg/mL showed 90% sensitivity and 72.9% specificity to predict the possibility of it resulting in haemodialysis within 2 years. In addition, a GDF 15 level higher than 490.4 pg/mL showed 63.64% sensitivity and 65% specificity to predict a decline in eGFR > 30 mL/min within 1 year of follow up. Moreover, initial serum GDF 15 level was associated with the development of interstitial fibrosis/tubular atrophy.

CONCLUSIONS: Initial serum GDF 15 level showed an inverse correlation with serum eGFR and was associated with worse renal outcome. Our results suggested that GDF 15 may play a role as a potential prognosticator in IgAN.