Abstract
Mantle cell lymphoma (MCL; previously called centrocytic lymphoma or lymphocytic lymphoma of intermediate differentiation) is a distinct subtype of B-cell lymphoma, accounting for approximately 3%-10% of all lymphoma diagnoses. The name refers to the growth pattern in early disease presentation resembling the normal mantle zone that surrounds the germinal center of the B-cell follicle. The hallmark of MCL is the t(11;14)(q13;q32), resulting in aberrant expression of the CCND1 gene and expression of cyclin D1 in the tumor cells. Expression and genomic profiling of MCL have provided new insight into the pathogenesis and will be summarized in this review. Pitfalls in the differential diagnosis versus B-cell chronic lymphocytic leukemia, B-cell prolymphocytic leukemia, cyclin D1-positive diffuse large B-cell lymphoma, hairy cell leukemia, and plasma cell tumors will be discussed, including the usefulness new diagnostic markers SOX11 and CD200. In situ MCL, MCL with an indolent clinical course, and cyclin D1-negative MCL are other topics of this review.
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