Clinical characteristics of PPL (MALT vs non-MALT) are shown in Table I . Patients with MALT lymphoma had a higher frequency of elevated LDH level at diagnosis (15.8% vs 70.0%, P 5 0.011) and B symptoms (21.1% vs 70.0%, P 5 0.017). Moreover, a significant difference in the rate of hilar/ mediastinal LAP was found between the MALT type lymphoma group and non-MALT lymphoma group (10.5% vs 70.0%, P 5 0.002).