BCL2 and neoplasm: Immunohistochemical staining showed that tumor cells were positive for CD20 (1:400 dilution; DAKO, Carpinteria, CA, USA, Fig. 4c), CD79a (1:200 dilution; DAKO, Carpinteria, CA, USA), and BCL2 (1:50 dilution; DAKO, Carpinteria, CA, USA, Fig. 4d) expression and negative for CD10 (1:50 dilution; Novocastra, Newcastle upon Tyne, UK), cyclin D1 (1:75 dilution; DAKO, Carpinteria, CA, USA) and CD30 (1:40 dilution; DAKO, Carpinteria, CA, USA).