Introduction
Malignancies during childhood constitute the 2nd cause of death, following injuries worldwide. According to epidemiological data, 300,000 new cases of neoplasia present themselves every year in children and teenagers under 19 years of age1, 160,000 of which concern children under the
Background Idiopathic nephrotic syndrome (INS) is the most frequent glomerular disease in childhood, with an incidence of 2-4 cases per 100,000 children. Currently, all children with INS are treated at onset with steroids. Approximately 80% of cases respond to oral corticosteroid therapy, but 75-80%