Abstract
Follicular lymphoma is a low-grade B-cell lymphoma of germinal center B-cell origin that typically lacks CD5 expression. We describe the clinicopathologic features of 88 cases of CD5+ follicular lymphoma (53 men, 35 women; median age, 60 years; range, 31-86). Follicular lymphoma was diagnosed initially in lymph nodes in 66 and extranodal sites in 22 patients. Eighty-one patients had lymphadenopathy, 66 had more than one involved site, 46 had bone marrow involvement, and 7 had splenomegaly. Staging information was available for 84 patients: 52 stage IV, 18 stage III, 12 stage II, and 2 stage I. Sixty-one cases were grade 1 or 2 and 27 were grade 3. The median proliferation index (Ki-67) was 30%. CD5 expression was detected by flow cytometry in 69, immunohistochemistry in 8, and both methods in 11 cases. The presence of t(14;18)(q32;q21)/IGH-BCL2 or other BCL2 translocation was detected in 28/44 (64%) cases. A total of 38 (43%) patients also had diffuse large B-cell lymphoma, concurrent with (n=20), subsequent to (n=13), or developing before CD5+ follicular lymphoma (n=5). All patients received chemotherapy; 12 also received stem-cell transplantation. With a median follow-up of 55 months (range, 0.5-207), 15 patients died, 46 wer...Continue Reading
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