FDR analysis showed that CD28 on CD28+CD45RA+CD8br was significantly associated with genetic susceptibility to T1D (p = 0.044), while EM DN (CD4−CD8−) %T cells (p = 0.899), EM CD8br %T cells (p = 0.902), IgD+CD38dim %lymphocytes (p = 0.902), CD80 on monocytes (p = 0.834), SSC-A on pDCs (p = 0.902), and FSC-A on pDCs (p = 0.902) were potentially associated with genetic susceptibility to T1D. This evidence concerns the gene CD28 and type 1 diabetes mellitus.