3.2. Cardiovascular Symptoms Were More Prevalent in Anti-Neutrophil Cytoplasmic Antibodies (ANCA)-Negative Eosinophilic Granulomatosis with Polyangiitis (EGPA) Patients than in Those with Anti-Myeloperoxidase Antibodies (MPO-ANCA) Presence. This evidence concerns the gene MPO and eosinophilic granulomatosis with polyangiitis.