- Histologically documented mantle cell lymphoma with co-expression of CD20 and CD5 and lack of CD23 expression by immunophenotyping and at least one of the following confirmatory tests: 1) positive immunostaining for cyclin D1; 2) the presence of t(11;14) on cytogenetic analysis; OR 3) molecular evidence of B-cell leukemia/lymphoma 1 (bcl-1)/immunoglobulin heavy locus (IgH) rearrangement