CCND1 and mantle cell lymphoma: For example, data for t(11; 14) translocation and cyclin D1 expression were missing for 53–102 patients, which limits certainty that patients had a definitive diagnosis of MCL; however, it is possible that such testing (and thus a definitive diagnosis of MCL made) had been conducted at a treatment facility different to the facility at which patients were enrolled into this PMS.