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High Frequency of Bone Marrow Involvement in Intravascular Large B-Cell Lymphoma.
International Journal of Surgical Pathology 2017 April
Intravascular large B-cell lymphoma (IVLBCL) is a rare subtype of diffuse large B-cell lymphoma. Thirteen cases of IVLBCL with a median age of 56 years were analyzed retrospectively. Nonspecific symptoms such as fever and hepatosplenomegaly were the most common manifestations, and the bone marrow was usually involved in 8/13 (61.5%) cases. All tumors expressed CD20, and 12/13 (92.3%) of the tumors exhibited a nongerminal center phenotype by Hans algorithm. CD5 was expressed in 3/12 (25%) of the tumors. MYC was negative in all cases, and BCL2 was positive in 10/12 (83.3%) cases. Cytogenetic analysis revealed 5 cases that did not have rearrangements in either the MYC or the BCL2 gene. No association with Epstein-Barr virus was found. Seven of 11 patients received chemotherapy. The median survival time was 6 months. Patients with hemophagocytic syndrome had poor prognoses. Our study demonstrates that IVLBCL has a poor clinical outcome with a high frequency of bone marrow involvement and that the MYC gene may not play an important role in the poor prognosis of IVLBCL.
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