Focal and segmental glomerulosclerosis in renal allograft recipients: a clinico-pathologic study of 37 cases.

Focal and segmental glomerulosclerosis (FSGS) in renal allografts may occur as a recurrence of primary FSGS, as a de novo phenomenon or as a complication of calcineurin inhibitor toxicity. There are very few studies in the literature describing the clinico-pathologic characteristics of FSGS in renal allografts. To the best of our knowledge, no such study exists from the Indian subcontinent. Thirty-seven cases showing FSGS, of 426 transplant biopsies performed over a 4-year period (2006-2009), were included in this study. The pre- and post-transplant clinical data were noted. FSGS was classified as per the Columbia scheme. Appropriate statistical tests were applied. The age of the study patients ranged from 13 to 54 years, with a male preponderance. Thirty-five patients (94.6%) were diagnosed as FSGS more than 12 months after transplantation. All the patients presented with renal dysfunction (median serum creatinine 2.8 mg/dL) and detectable proteinuria at the time of diagnosis. Histologically, FSGS-NOS (70.3%) was observed as the most common subtype, followed by collapsing and perihilar varieties (13.5% each). Most of the biopsies (83.7%) showed grade-2 to -3 interstitial fibrosis and tubular atrophy. Follow-up data were available in 27 patients (73%), of whom 12 (44.4%) had graft loss with dialysis-dependent state at last follow-up. FSGS is one of the important causes of graft dysfunction, especially late in the post-transplantation period in cases of de novo FSGS. The long-term outcome of renal allografts developing this glomerular pathology is quite dismal, with a significant proportion of patients suffering graft loss.