CD79A and Alzheimer disease: Furthermore, IgA levels in NC did not differ between APOEε4 non-carriers and carriers (3.36 ± 1.72 vs 3.59 ± 1.38 mg/ml, respectively) (p = 0.652), but IgA levels in AD patients were significantly higher in APOEε4 non-carriers compared to carriers (Additional file 2: Fig. S1).