CD274 and B-cell non-Hodgkin lymphoma: A puncture biopsy of the right mammary gland tumor was performed again, and it showed CD20 (+), CD79a (+), CD3 (-), CD19 (100%+), PD-1 (-), PD-L1 (-), and Ki-67 (70%+), followed by a pathological diagnosis of high-grade B-cell lymphoma.