Herein we analyzed survival outcomes in chemotherapy-treated patients with plasmablastic lymphoma (PBL) diagnosed between 2010 to 2016 (n = 248). Data was acquired from the Surveillance, Epidemiology, and End Results (SEER) 18 registries database (April 2019 release based on November 2018 submission). The majority of patients were male (81.9%) and younger than 60 years (71.0%). Oral and gastrointestinal (GI) sites were the most frequent primary extranodal locations (23% and 19.4%, respectively). Oral primary location was inversely associated with presence of B symptoms and advanced Ann-Arbor stage. The 3-year and 5-year overall survival (OS) rates of treated PBL patients were 54% (95% CI: 46.5%-60.8%) and 52.8% (95% CI: 45.2%-59.8%). Three-year conditional survival for 2-year and 3-year survivors were 90.3% and 97.8%, overlapping the survival of a general population matched by age, sex and calendar year. In a multivariable analysis, oral primary location was associated with not only better OS (HR 0.43; 95% CI: 0.21-0.88, P = .021) but also better lymphoma-specific survival (LSS) (SHR 0.36; 95% CI: 0.15-0.86, P = .022); age ≥60 years was associated with shorter LSS (SHR 1.73; 95% CI: 1.02-2.96, P = .043). Seven registries granted access to HIV status (n = 93) where HIV infection was detected in 52.7% of cases. The HIV status did not affect survival outcomes in unadjusted and adjusted analyses. We identified clinical characteristics associated with survival and showed that treated PBL patients may achieve long-term survival. 1 | INTRODUCTION Plasmablastic lymphoma (PBL) is a rare aggressive non-Hodgkin lymphoma with unknown incidence. Plasmablastic lymphoma was first described as a distinct clinicopathological entity in 1997 by Delecluse et al. and was shown to be associated with HIV infection (15 of 16 cases), Epstein-Barr virus (EBV) infection (9 of 16 cases) and a predilection for oral cavity, particularly jaw mucosa. 1 Subsequently, PBL was described in non-HIV patients with primary involvement outside of the oral cavity and was incorporated as a distinct clinical lymphoma type into the latest World Health Organization lymphoma classification. 2 It is considered to be a subtype of large B-cell lymphoma with plasmablastic morphology and expression of plasma cell markers (CD79a, CD38, CD138 and MUM-1), but lacking expression of B-cell markers (CD20, PAX-5). 3 The differential diagnosis includes immunoblastic diffuse large B-cell lymphoma, ALK positive diffuse large B-cell lymphoma, HHV-8 positive large B-cell lymphoma, primary effusion lymphoma, plasmablastic or anaplastic multiple myeloma and undifferentiated carcinoma. 3-5 Nodal involvement and association with HIV and EBV are typical for PBL but not seen in plasma cell neoplasms. 5-7 Plasmablastic lymphoma is an aggressive lymphoma with overall survival (OS) ranging from 7 to 62 months, according to small Jorge A. Florindez and Juan Pablo Alderuccio contributed equally to this study.