The vascular health parameters were significantly lower in T1DM individuals than in HCs, including cEPCs, i.e., CD34+ (p < 0.0001) and CD34+CD133+ (p = 0.013) per 100 lymphocytes, as well as CFU-Hill’s colonies (p = 0.04) and PACs (p < 0.001). This evidence concerns the gene CD34 and type 1 diabetes mellitus.