 In this study, researchers investigated the relationship between supar serum levels and primary FSGS. They found that supar serum levels were not associated with FSGS, but they did find a positive correlation with potasite and glomerular lesions, as well as an inverse correlation with renal function. This suggests that supar may be a useful biomarker of glomerular damage. This article was authored by Miguel Vardelho, Ana Carina Ferreira, Maria Susantos and others.