- To determine the proportion of the cell of origin subtypes (germinal center B-cell-like [GCB] vs non-GCB) and expression levels of prognostic genes previously identified in diffuse large B-cell lymphoma (DLBCL) in patient biopsy samples from SWOG trials of limited- and advanced-stage DLBCL, and to assess the association between the results and progression-free survival (PFS).