IgGĸ: Immunoglobulin G kappa; IgGλ: Immunoglobulin G lambda; IgAĸ: Immunoglobulin A kappa; IgAλ: Immunoglobulin A lambda; LCD: Light chain disease; IgG/IgA: Immunoglobulin G and Immunoglobulin A; TB: Tuberculosis; BMI: Body mass index; COPD: Chronic obstructive pulmonary disease; MM: Multiple myeloma; ECOG: Eastern Cooperative Oncology Group. The gene discussed is CD79A; the disease is Miyoshi myopathy.