Neonatal diabetes mellitus is a rare monogenic disease with incidence of 1/90,000 newborns. A case of two months aged male infant with life threatening diabetic ketoacidosis is presented with novel ABCC8 gene mutation (p.F577L), successful transition from insulin to sulfonylurea and follow-up of three years.

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A significant increase in the catalase activity in all phases of type 1 diabetes indirectly confirms the importance of the oxidative stress in pathogenesis of disease. The activation of catalase is probably the secundary phenomenon. The fact that the catalase activity reaches its highest values at the beginning of diabetes could implicate the predictive value of catalase determination.

The reduction in the number of germ cells in patients with cryptorchidism from Vojvodina is more pronounced than patients from either Switzerland or USA. This is a unique observation, since such a study has not been published yet.