Negative CD5, CD23, and cyclinD1 also help differentiate between small lymphocytic lymphoma/chronic lymphocytic leukemia (SLL/CLL) and mantle cell lymphoma, while CD10 helps distinguish follicular lymphoma; therefore, patients are likely to be considered to have pulmonary MALT-MZL. The gene discussed is CCND1; the disease is B-cell chronic lymphocytic leukemia.