CD226 and type 1 diabetes mellitus: The frequency of CD226+ B cells was positively related to FBG (r = 0.32, P < 0.05), HbA1c (r = 0.32, P < 0.05) and GA levels (r = 0.37, P < 0.05), and negatively related to FCP levels (r = −0.40, P < 0.05) in T1D patients.