Validation of Biomarkers of Diabetic Nephropathy in Type I Diabetic Children

Inclusion Criteria: * Patient with a type I diabetes diagnosed before 15 years-old * Urinary collection done 5 years after the diagnosis * Urinary collection done without any acute intermittent pathology * Urinary collection done without any treatment (other than diabetes treatment) * Glomerular filtration rate ≥ 60 mL/min at the moment of the urinary collection already done * Informed consent obtained aposteriori for the analysis of the urinary samples collected between 2004 and 2008, and consent obtained for the analysis of urinary sample collected in 2013 Exclusion Criteria: * Patients suffering from an autoimmune disease associated with the diabetes (vitiligo, Grave's disease, thyroiditis, pernicious anemia or Biermer's disease) * Patient with a renal disease (other than diabetic nephropathy) at the first urinary collection (between 2004 and 2008) * Pregnancy, because the urinary proteome and the microalbumin dosage can be modified during a pregnancy. * Patient refusal to use urinary samples already collected