Sex, median age, primary wAIHA, median Padua's score at wAIHA diagnosis, median Padua's score at VTE diagnosis, antiplatelet therapy, VKA, dyspnea, hemoglobin, reticulocytes, elevated LDH, free bilirubin, CRP, CRP at VTE diagnosis, CH50 < N, C3 < N, C4 < N, abnormality of lymphoid lineage on bone marrow aspirate, splenomegaly, hepatomegaly, adenopathy. This evidence concerns the gene C4A and Splenomegaly.