MO244: PCSK9 Inhibitors are Efficient in Treatment of Resistant Hypercholesterolemia in Nephrotic Syndrome

Abstract

Abstract BACKGROUND AND AIMS Hypercholesterolemia in nephrotic syndrome is commonly resistant to statin therapy and represents an important clinical challenge both for cardiovascular risk prevention and to eliminate lipotoxic effect on podocytes. Serum PCSK9 level is elevated in nephrotic syndrome and has a key pathophysiologic role in development and persistance of hyperlipidemia. Thus, we aimed to investigate the role of PCSK9 inhibitors in control of hypercholesterolemia in patients with neprotic syndrome. METHOD Consecutive patients with nephrotic syndrome and elevated atherogenic Lp (a) (n = 4) and patients with resistant secondary glomerulonephritis with nephrotic proteinuria (n = 2) were included. In all patients, in addition to full dose statin therapy, evolocumab 420 mg s.c. monthly was introduced. Lipid levels were measured after a median of 4 (range 2–9) months after starting evolocumab. RESULTS Nephrotic syndrome was caused by focal segmental glomerulosclerosis in four patients (66.7%) and membranous nepropathy was the cause in two patients (33.3%). Median age of included patients was 49.5 (range 24–70) years. Four patients with primary cause of glomerulonephritis received specific imunosupressive treatment. During follow-up, we observed descrease in glomerular filtration rate (eGFR median 58.5 interquartile range (IQR) [46.7–98.7] mL/min/1.73 m2 versus median 47 IQR [38.25–89.25] mL/min/1.73 m2; P = .046) and persistence of proteinuria [median 11 970 IQR (3862–13 765) mg/dU versus median 10 847 (5407–14 340) mg/dU; P = .753]. However, despite persistent proteinuria and decrease in eGFR, significant decrease in total cholesterol [median 9.10 IQR (6.92–10.87) mmol/L versus median 6.81 (5.4–8.45) mmol/L; P = .028] and LDL cholesterol [median 5.40 IQR (4.12–7.25) versus median 4.04 IQR (2.70–4.60); P = .046] was observed. There was no significant difference in Lp (a) and triglyceride levels. CONCLUSION PCSK9 inhibitors are a promising new therapeutic option for hyperlipidemia in patients with nephrotic syndrome. Further research, including a larger number of patients, is needed to correctly position PCSK9 inhibitors in treatment of hyperlipidemia in patients with nephrotic syndrome.