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High prevalence of the MYD88 mutation in testicular lymphoma: Immunohistochemical and genetic analyses
Author(s) -
Oishi Naoki,
Kondo Tetsuo,
Nakazawa Tadao,
Mochizuki Kunio,
Tanioka Fumihiko,
Oyama Toshio,
Yamamoto Tomoko,
Iizuka Junpei,
Tanabe Kazunari,
Shibata Noriyuki,
Kirito Keita,
Katoh Ryohei
Publication year - 2015
Publication title -
pathology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.73
H-Index - 74
eISSN - 1440-1827
pISSN - 1320-5463
DOI - 10.1111/pin.12336
Subject(s) - germinal center , immunohistochemistry , sanger sequencing , lymphoma , mutation , diffuse large b cell lymphoma , biology , cancer research , pathology , gene , b cell , medicine , antibody , genetics , immunology
The activating mutation of MYD88 has been identified in diffuse large B ‐cell lymphoma ( DLBCL ). We investigated the mutational status and both the gene amplification and protein expression of MYD88 in 23 cases of testicular DLBCL . To detect the MYD88 mutations, we employed the allele‐specific PCR and Sanger sequencing. MYD88 gene amplification and protein expression were analyzed by quantitative PCR and by immunohistochemistry, respectively. There were 17 cases of primary testicular DLBCL : 94% (16/17) exhibited a non‐ G erminal center B ‐cell (non‐ GCB ) subtype, 82% (14/17) showed the MYD88 L265P , and 65% (11/17) had intense expression of MYD88 . When compared with normal lymph nodes, the MYD88 is significantly amplified in primary testicular DLBCL . However, the amplification status showed no correlation with its mutational status or protein expression. Moreover, neither the MYD88 mutational status nor the expression pattern affected overall survival. Six cases were secondary testicular DLBCL with an 83% (5/6) and an 80% (4/5) incidence of the non‐ GCB subtype and of the MYD88 L265P , respectively. In conclusion, we demonstrated a high prevalence of the non‐ GCB subtype and the common MYD88 L265P in both primary and secondary testicular DLBCL . Our data suggest that the MYD88 mutation is a fairly consistent genetic feature in testicular DLBCL .