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CD200 expression in mantle cell lymphoma identifies a unique subgroup of patients with frequent IGHV mutations, absence of SOX11 expression, and an indolent clinical course.
Modern Pathology 2018 Februrary
CD200, a marker currently utilized in the diagnosis of B-cell lymphoma, is uniformly positive in chronic lymphocytic leukemia/chronic lymphocytic leukemia, and is usually absent in mantle cell lymphoma. Over a 6 year-period, of 668 mantle cell lymphoma assessed by flow cytometry, CD200 expression was detected in 25 patients (~4%). All 25 patients had bone marrow involvement; however, 11 (44%) patients had no nodal or extranodal disease and belonged to non-nodal leukemic variant mantle cell lymphoma. Morphologically, bone marrow showed an unusual interstitial infiltrative pattern in 14/25 (56%) and small round cells resembling chronic lymphocytic leukemia in 9/25 (36%). CD23 was positive in 19/25 (76%) patients; and SOX11 was only positive in 5/21(24%). All 4 patients tested showed IGHV mutations. With a median follow-up of 23 months, 12/24 (50%) patients were not treated. These clinicopathological features were significantly different from 154 randomly chosen CD200-negative mantle cell lymphoma patients, in SOX11 positivity (24% versus 74%, P<0.0001), CD23 expression (76% versus 8%, P<0.0001), a non-nodal leukemic presentation (44% versus 2%, P<0.001), and therapy requirement (50% versus 92%, P<0.0001). This is the first study to show that CD200 expression in mantle cell lymphoma, though uncommon, identifies a subgroup of mantle cell lymphoma patients with characteristic pathological features, frequent non-nodal leukemic variant, and an indolent clinical course.
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