IL18 and mantle cell lymphoma: Specifically, the densities of IL‐1β+, IL‐18+, and caspase‐1 cells were: 164.6 ± 24.7, 233.8 ± 26.3, and 207.9 ± 25.9 cells/mm2 in CL; 116.4 ± 51.0, 205.7 ± 65.9, and 111.5 ± 36.6 in skin lesions; and 83.9 ± 9.5, 109.1 ± 53.4, and 99.2 ± 54.6 in mucosal lesions of MCL, respectively (Figure 4).