Another study conducted among 45 Polish patients with long-term T1DM without advanced complications, identified 9 patients as carriers of 10 variants in 4 genes associated with MODY diabetes (ABCC8, GCK, HNF1A, HNF1B), confirming that MODY cases are frequently misdiagnosed as type 1 or type 2 diabetes [16]. The gene discussed is HNF1B; the disease is type 2 diabetes mellitus.