NF1 and congenital nephrotic syndrome, Finnish type: The prevalence of CNF and PNF in our study was high in the NF1 whole gene deletion group (37/38 and 36/38 patients (97% and 95%)) as well as in the control group (27/38 and 28/38 patients (71%and 74%)) and thus higher than that reported in previous studies (76–85% and 50–76%)[14, 28, 29, 36].