FSGS Recurrence Collaboration: Report of a symposium

Since it was first described more than 50 years ago, recurrence of FSGS in kidney allografts has frustrated the transplant community. This rare condition is associated with considerable morbidity, and it is the most common cause of graft loss in patients with CKD stage 5 due to FSGS. However, the problem remains insufficiently studied. It is an ultra-orphan disease and incidence rates at individual centers are often very low and unpredictable. The published literature contains conflicting reports in basic epidemiologic data. Progress in defining the mechanisms of disease and advancing therapeutic options has been limited. The treatment options that are currently available are limited and largely ineffective. The range in time to recurrence and variability in responsiveness to treatment suggest that recurrence is not a single entity, but rather multiple phenotypes resulting from diverse pathogenetic mechanisms grouped under a larger umbrella. There is an urgent need for innovative basic science and translational research to [1] better understand FSGS recurrence from a mechanistic perspective; [2] improve risk stratification to predict this outcome; and [3] develop effective therapies. In this conference report, we describe the work of investigators whose state-of-the-art research paves the way for innovative approaches to diagnosis and treatment of the problem and provides hope that we can achieve these objectives for affected patients.