Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2010.194.197FakhrjouA. BozorgiF. 42010134This study aimed at assessing the expression rate of IgA and IgM in B cell lymphoma immunohistochemically. Paraffin-embedded specimens of NHL evaluated for presence of CD20 by immunohistochemical staining and then, the positive cases were again immunohistochemically assessed for expression of IgM and IgA. Fifty two paraffin-embedded specimens evaluated. Thirty six cases (69.2%) were positive for the CD20. The mean age of these patients (CD20+ cases) was 50.0±23.6 years. Twenty two cases (61%) were male and 14 cases (39%) were female. The frequency of the IgM+, IgA+ and IgA/IgM+ (simultaneous) cases was 15(41.7%), 9(25%) and 4(11.1%), respectively. The current rates are in the range of similar reports in the literature.]]>Aarts, W.M., R.J. Bende, J.W. Vaandrager, P.M. Kluin, A.W. Langerak, S.T. Pals and C.J.M. van Noesel,2002In situ analysis of the variable heavy chain gene of an IgM/IgG-expressing follicular lymphoma: evidence for interfollicular trafficking of tumor cells.]]>160883891Andriko, J.A., S.H. Swerdlow, N.I. Aguilera and S.L. Abbondanzo,200125742751Bende, R.J., L.A. Smit, J.G. Bossenbroek, W.M. Aarts and M. Spaargaren et al.,2003162105113Cotran, R., V. Kumar and T. Collins,19996th Edn.,Dominis, M., S. Dzebro, S. Gasparov, A. Pesut and R. Kusec,200243535540Inagaki, H., J.K. Chan, J.W. Ng, M. Okabe and T. Yoshino et al.,200216014351443Ioachim, L. and H. Ratech,20023rd Edn.,Jaffe, E.,19993rd Edn.,Mills, S.E., D. Carter, J.K. Greenson, H.A. Oberman and V.E. Reuter,20044th Edn.,Rosai, J.,20049th Edn.,Sitia, R., A. Rubartelli and U. Hammerling,198112713881394Strauchen, J.A. and J.P. Mandeli,199195692695Tada, N. and U. Hämmerling,198011719