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International Journal of Clinical and Experimental Pathology (1)
Journal of Korean Medical Science (1)
Kim, Wonseog (2)
Arita, Kotaro (1)
Karube, Kennosuke (1)
Kato, Harumi (1)
Kim, Kihyun (1)
Ko, Young H. (1)
Ko, Young-Hyeh (1)
Liu, Fang (1)
Park, Sanghui (1)
Seto, Masao (1)
Sung, Chang Ohk (1)
Tsuzuki, Shinobu (1)
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Yoshida, Noriaki (1)
Year of Publication
Mutation analysis of NF-κB signal pathway-related genes in ocular MALT lymphoma
International Journal of Clinical and Experimental Pathology
Constitutive nuclear factor-kappa B (NF-κB) activation has been reported in ocular adnexal lymphoma (OAL). TNFAIP3/A20 is a “global” inhibitor of NF-κB pathway. We have shown that OAL has preferential loss of the 6q23.3 region where TNFAIP3/A20 exist, which is suggested to involve in lymphomagenesis of OAL. The mechanisms causing NF-κB activity in OAL remain elusive. Recently, NF-κB canonical pathway genes including CARD11, CD79B and MYD88 were shown to be frequently mutated in diffuse large B-cell lymphomas. In this study, we analyzed the mutation status of these genes by direct sequencing in 24 OAL cases including 9 cases with loss of 6q23.3 previously identified by array comparative genomic hybridization. We showed that genetic alterations of these genes were not found in OAL, a finding differing from that of most B-cell lymphomas. Genetic or epigenetic alterations in other genes are likely to be relevant in pathogenesis of OAL case without A20 loss.
Ocular adnexal lymphoma; TNFAIP3 (A20) deletion; NF-κB related gene mutation
Immunoreactivity of CD99 in Non-Hodgkin's Lymphoma: Unexpected Frequent Expression in ALK-positive Anaplastic Large Cell Lymphoma
Sung, Chang Ohk
Ko, Young H.
Journal of Korean Medical Science
To verify the spectrum of CD99-expressing lymphoid malignancy, an immunohistochemical study for CD99 was carried out in 182 cases of non-Hodgkin's lymphoma, including 21 lymphoblastic lymphomas, 11 small lymphocytic lymphomas, 9 mantle cell lymphomas, 12 follicular lymphomas, 37 diffuse large B cell lymphomas, 18 Burkitt's lymphomas, 28 NK/T-cell lymphomas, 8 angioimmunoblastic T-cell lymphomas, 23 peripheral T-cell lymphomas, unspecified, and 15 systemic anaplastic large cell lymphomas. CD99 was positive in all T-lymphoblastic lymphomas and in 60% of B-lymphoblastic lymphomas. Majority of T and NK cell lymphomas were negative for CD99, except anaplastic large cell lymphomas (ALCLs). Eight of 15 cases (54%) of ALCLs reacted with anti CD99 antibody. Seven of 10 (70%) ALK positive ALCLs expressed CD99, whereas only 1 of 5 (20%) ALK negative ALCLs were positive. Of the mature B-cell lymphomas, 5.4% (2/37) of diffuse large B cell lymphomas and 11.1% (2/18) of Burkitt's lymphomas expressed CD99. In conclusion, CD99 is infrequently expressed in mature B and T cell lymphomas, except ALK-positive ALCL. High expression of CD99 in ALK-positive ALCL is unexpected finding and its biologic and clinical significances have yet to be clarified.
CD99 protein, human; Lymphoma, Non-Hodgkin; Lymphoma, Large-Cell, Ki-1
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