Extranodal presentation in limited-stage diffuse large Bcell lymphoma as a prognostic marker in three SWOG trials S0014, S0313 and S1001

Abstract

Several recent trials have changed the standard-of-care for patients with limited stage (LS) diffuse large B-cell lymphoma (DLBCL) by minimizing the number of chemoimmunotherapy cycles and/or eliminating the need for radiotherapy without compromising long-term outcomes. However, there may be patient subsets where an abbreviated-treatment approach is insufficient. With this in mind, Bobillo et al., retrospectively reviewed LS DLBCL patients treated at a single institution with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (RCHOP) for four to six cycles with or without radio-therapy. This group reported that an extranodal presentation had shorter progression-free (PFS) and overall survival (OS) compared with nodal presentation. In these patients, consolidative radiotherapy prolonged survival in patients with extranodal disease, especially those with a positive positron emission tomography (PET) scan at the end of chemoimmunotherapy. In response, we analyzed similar patients treated on three consecutive SWOG studies (S0014, S0313, S1001; clinicaltrails gov. Identifier: NCT00005089, NCT00070018, NCT01359592).