The breast and GIT are connected via the mucosal immune system, such that infection or immunization of one mucosal organ can induce immunoglobulin A (IgA) production at a distal mucosal site and protect it from the same infection.108 Characterizing the association between breast cancer and gastrointestinal dysbiosis would be of interest in establishing a relationship in pathogenesis. The gene discussed is CD79A; the disease is infection.