IGHA1 and IgA glomerulonephritis: Although our study included patients with IgA nephropathy treated with renal transplantation, it is not possible to evaluate the association of serum levels of Gd-IgA1, total IgA1 and IgA-IgG complexes on the recurrence of IgAN due to the small number of patients, the low recurrence rate and the short follow-up period.