The antibody chain Ig kappa chain V‐III region CLL (P04207) was the protein with the highest significant correlation to the Roche S‐Ab test (P: 2.3*10−53; R: 0.67), but showed little correlation to the EUR S‐IgG, EUR N‐IgG, and EUR S‐IgA tests (R < 0.30; Fig 6C). The gene discussed is CD79A; the disease is B-cell chronic lymphocytic leukemia.