A tetraploid clone, reported to be more common in pleomorphic and blastoid variants of MCL,23 was seen in 12 cases of MCL (3.7%) and 10 cases of PCN (3.6%) with a similar distribution among the CCND1/IGH FISH subtypes (typical vs atypical) (P = 1) (Table 2C, Figure 2C). The gene discussed is CCND1; the disease is mantle cell lymphoma.