MALT and non-MALT PPLs are reported to differ in clinical behavior and prognosis [7, [11] [12] [13] . In this series, hilar/mediastinal LAP, high-LDH elevation, and B symptoms were more frequent in non-MALT lymphoma. Our data demonstrated that hilar/mediastinal LAP was the only independent prognostic factor in PPL in multivariate analysis. Previous studies have presented little evidence indicating the prognostic significance of hilar/mediastinal LAP in PPL [6] . Previous reports focused mainly on MALT lymphoma and some studies did not include patients with hilar/mediastinal LAP [7, 14, 15] . Until now, no risk factors have been clearly identified in PPL. Our findings showed that patients with MALT type PPL survived longer than those with non-MALT PPL, but unlike other authors [11] [12] [13] 16] .