Renal outcome in IgA nephropathy according to Oxford classification and ultrastructural analysis in a Brazilian center

Correlate clinical and histologic features with renal outcome in patients with biopsy-proven IgA nephropathy (IgAN). Retrospective analysis of records and renal tissue of IgAN patients. Histology was revised according to MEST score of Oxford classification. Focal segmental glomerulosclerosis (FSGS) features were assessed by light microscopy. Electron microscopy review searched for podocyte effacement. 67 patients were included, 56.7% men, mean age 34.5 ± 12.5 years, mean arterial pressure (MAP) 106 ± 18 mmHg, estimated glomerular filtration rate (eGFR) 63.32 ± 43.07 mL/min/1.73m and proteinuria 3.1 ± 2.2 g/24 h. M1 was seen in 38 patients (56.7%), E1 in 12 (17.9%), S1 in 49 (73.1%), T1 in 18 (26.8%), and T2 in 17 (25.3%). Mean effacement index (EI) was 0.81 ± 0.18 and did not correlate with proteinuria. 27 patients (40.2%) had end-stage renal disease (ESRD) which correlated with MAP (p = 0.002), eGFR (p = 0.0003), T1 (p = 0.0008) and T2 (p = 0.0001), follow-up MAP (p = 0.02) and follow-up proteinuria (p = 0.01 for 1.0 - 4.0 g/24 h and p = 0.005 for ≥ 4.0 g/24 h). T score correlated with MAP and proteinuria at baseline (p = 0.0001 and 0.0097, respectively) and during follow-up (p = 0.0001 and