Cervical lymph node biopsy diagnosis showed diffuse malignant lymphoma, and IHC staining confirmed the tumor subtype as follicular center cell lymphoma (a non-Hodgkin lymphoma).On IHC, malignant cells displayed positive immunoreactivity for CD10, CD20, BCL2, TdT, LCA, and ki67 and negative immunoreactivity for CD3, CD4, CD5, CD16, CD30, CD56, CD79a, BCL6, and PAX-5 (Table 1). This evidence concerns the gene MKI67 and neoplasm.