MAPT and Alzheimer disease: A set of 3 proteins (calsyntenin-1, neurexin-2a and thy-1) showed pair-wise correlation in all groups (FTLD-Tau; rs = 0.79-0.87, p < 0.0001, FTLD-TDP; rs = 0.70-0.88, p < 0.009, AD; rs = 0.55-0.78, p < 0.007, Controls; rs = 0.68-0.81, p < 0.0001), while all other protein combinations were group-dependent.