HNF1B and type 1 diabetes mellitus: described a 26-year-old male with hydronephrosis, non-insulin-dependent diabetes, and detectable C-peptide with a pathogenic 1.39 Mb deletion of 17q12 containing 20 genes, including HNF1B, which is different from our case with a deletion of 1.48 Mb involving 15 genes, with detectable C-peptide being an insulin-dependent diabetes patient report [20].