TNFSF13B and B-cell non-Hodgkin lymphoma: Serum BAFF level (pg/ml) in GI lymphoma group was 834.2 ± 694.3, non-GI lymphoma group was 1251 ± 976.6, B cell lymphoma group was 1206 ± 955.9, and non-B cell lymphoma group was 1113 ± 920.6.