4 1 0.1 5 0.2 Acute renal failure 2 0.2 2 0.2 4 0.2 CYT387 Drug-induced nephropathy 2 0.2 1 0.1 3 0.1 Renal

disorder with metabolic disease 1 0.1 0 – 1 0.0 Hypertensive nephropathy 0 – 1 0.1 1 0.0 Others learn more 5 0.5 2 0.2 7 0.3 Total 1,001 100.0 1,176 100.0 2,177 100.0 Table 17 The frequency of pathological diagnoses as classified by histopathology in IgAN in native kidneys in J-RBR 2009 and 2010 Pathological diagnosis by histopathology 2009 2010 Total n % n % n % Mesangial proliferative glomerulonephritis 937 93.6 1,111 94.5 2,048 94.1 Endocapillary proliferative glomerulonephritis 12 1.2 2 0.2 14 0.6 Minor glomerular abnormalities 12 1.2 15 1.3 27 1.2 Focal segmental glomerulosclerosis 9 0.9 6 0.5 15 0.7 Crescentic and necrotizing glomerulonephritis 8 0.8 10 0.9 18 0.8 Nephrosclerosis 6 0.6 4 0.3 10 0.5 Membranous nephropathy 4 0.4 2 0.2 6 0.3 Membranoproliferative glomerulonephritis (types I and III) 4 0.4 5 0.4 9 0.4 Sclerosing glomerulonephritis 3 0.3 2 0.2 5 0.2 Chronic interstitial nephritis 1 0.1 2 0.2 3 0.1 Acute interstitial nephritis 0 – 1 0.1

1 0.0 Others 5 0.5 16 1.4 21 1.0 Total 1,001 100.0 1,176 100.0 2,177 100.0 Table 18 Distribution of CKD stages and clinical parameters in total in IgA nephropathy in J-RBR: Combined data of 2009 and 2010   CKD stage Total P value*   G1 G2 G3a/b G4 G5 Total 663 814 551 111 30 2,169 – n (%) 30.6 37.5 25.4 5.1 1.4 100.0 – Age (years), average 23.5 ± 10.9 40.3 ± 13.5 50.9 ± 13.0 SHP099 mouse 55.7 ± 16.2 46.3 ± 20.4 38.7 ± 17.1 <0.0001  Median 22 (17–29) 38 (30–50) 52 (42–61) 59 (44–68) 46 (29–62) 37 (25–52) <0.0001 Body mass index 21.0 ± 4.0 22.9 ± 3.8 23.6 ± 3.7 23.0 ± 4.5 23.4 ± 5.9 22.5 ± 4.0 <0.0001 Estimated GFR (mL/min/1.73 m2) 108.2 (96.9–128.0) 75.2 (67.8–82.7) 49.1 (42.0–54.6) 23.6 (20.9–27.6) 8.5 (6.1–12.0)

74.6 (53.8–95.0) <0.0001 Proteinuria (g/day) 0.30 (0.10–0.81) 0.50 (0.21–1.00) 0.92 (0.40–2.00) 1.60 (0.71–2.84) 2.81 (1.17–4.58) 0.59 (0.22–1.29) <0.0001 Proteinuria (g/gCr) 0.39 (0.14–0.91) 0.63 (0.28–1.23) 1.03 (0.51–2.01) 1.69 (0.77–4.21) 2.91 (1.30–4.58) 0.70 (0.27–1.47) <0.0001 Sediment RBC ≥5/hpf (%) many 82.4 81.3 74.6 82.0 86.7 80.0 0.0075 Serum creatinine (mg/dL) 0.60 (0.53–0.70) 0.79 (0.70–0.91) 1.16 (1.00–1.36) 2.10 (1.86–2.47) 5.34 (4.06–7.66) 0.81 (0.65–1.07) <0.0001 Serum albumin (g/dL) 4.15 ± 0.46 4.02 ± 0.49 3.79 ± 0.59 3.45 ± 0.63 3.22 ± 0.59 3.96 ± 0.56 <0.0001 Serum total cholesterol (mg/dL) 184.6 ± 37.4 204.3 ± 46.2 209.9 ± 51.1 211.6 ± 52.3 221.0 ± 58.6 200.2 ± 46.8 <0.0001 Systolic BP (mmHg) 113.9 ± 14.0 123.3 ± 16.2 130.3 ± 17.5 137.6 ± 22.5 147.5 ± 27.9 123.2 ± 18.1 <0.0001 Diastolic BP (mmHg) 67.6 ± 11.4 75.1 ± 12.3 78.9 ± 12.5 81.0 ± 15.6 87.8 ± 18.0 74.2 ± 13.3 <0.0001 Anti-hypertensive agents (%) 13.8 33.3 59.6 75.8 71.4 37.0 <0.0001 Diabetes mellitus (%) 1.5 3.1 7.7 21.1 0.0 4.6 <0.