Classification of first and successive renal biopsies according to the International Society of Nephrology/Renal Pathology Society (ISN/RPS) 2003 classification of lupus nephritis15
| Lupus nephritis classification | 1st biopsy (n=45) | 2nd biopsy (n=45) | 3rd biopsy (n=18) | 4th biopsy (n=7) | 5th biopsy (n=1) |
|---|---|---|---|---|---|
| Class II, n | 5 | 3 | 0 | 0 | 0 |
| Class III, n | 4 | 2 | 2 | 0 | 1 |
| Class IV, n | 22 | 25 | 6 | 4 | 0 |
| Class V, n | 7 | 8 | 3 | 1 | 0 |
| Class VI, n | 0 | 2 | 2 | 1 | 0 |
| Combination between III/IV+V, n | 1 | 3 | 5 | 1 | 0 |
| Vasculopathy, n | 1 | 0 | 0 | 0 | 0 |
| Unknown, n | 5 | 2 | 0 | 0 | 0 |