The lymphoma cells were positive for CD79a (Image G), PAX5, CD10 (diffuse, Image H), BCL‐6, MUM1, MYC, BCL‐2, CD3 (subset, image I) and CD5 (subset), and negative for TdT and CD61, with a proliferation index of 80% (Image J). The gene discussed is CD5; the disease is lymphoma.