CD40LG and autosomal dominant polycystic kidney disease: RPRF, rapid progressive renal failure; RPGN, rapid progressive glomerulonephritis; ADPKD, autosomal dominant polycystic kidney disease; IgG, immunoglobulin G; IgM, immunoglobulin M; Pre-KT, pre-kidney transplantation; M, male; F, female; SD, standard deviation; HLA, human leukocyte antigen.