The spectrum of renal histologies seen in HIV with outcomes, prognostic indicators and clinical correlations.

BACKGROUND Two hundred and twenty-one HIV-positive renal biopsies were analysed from Groote Schuur Hospital to determine outcomes and prognostic indicators based on histology and clinical features. METHODS The histology findings were compared with patient demographics, clinical and renal parameters, mortality, CD4 count and date of commencing combined anti-retroviral therapy (cART). Follow-up was between 1 and 3.5 years. RESULTS We found a spectrum of renal histologies in HIV-positive patients of which HIV-associated nephropathy (HIVAN) was the most common histology. cART reduced the mortality in those with any feature of HIVAN by 57% [adjusted hazard ratio (AHR) 0.43, 95% confidence interval (CI) 0.22-0.85]. Of those patients with HIVAN who died, 79% died of renal failure as registered on their death certificate. Proteinuria and microcysts were shown to be poor prognostic indicators (AHR 1.36: 1.09-1.70 and 2.04: 1.24-3.37). In patients with HIVAN alone followed for up to 2 years on cART, estimated glomerular filtration rate remained stable and there was a trend towards decreased proteinuria. cART improved survival in patients with isolated immune complex disease. CONCLUSIONS As mortality is improved in patients with any feature of HIVAN or isolated immune complex disease, cART should be initiated once any of these histological features are established. We believe the spectrum of disease that constitutes HIVAN needs to be more specifically defined. The ultimate outcome may be determined by the histological subtype.