• Ruqaiya Shahid, Rubina Gulzar, Lubna Avesi, Saba Hassan, Farheen Danish, and Talat Mirza.
• Department of Pathology, Dow International Medical College, Dow Research and Reference Laboratory, Dow University of Health Sciences, Karachi.
• J Coll Physicians Surg Pak. 2016 Feb 1; 26 (2): 103-7.

ObjectiveTo analyze the frequencies of histological types of lymphoma, diagnosed with complete immunohistochemical profile in younger and older age group.Study DesignCross-sectional analytical study.Place And Duration Of StudyDow Diagnostic Research and Reference Laboratory, Dow University of Health Sciences, Karachi, from January 2009 to September 2013.MethodologyConsecutive cases of lymphomas, which were diagnosed using immunohistochemistry, were analyzed according to WHO classification. Frequency and percentages for different types of lymphomas were calculated. Hodgkin and non-Hodgkin lymphomas characteristics in two age groups of less than and more than 40 years were compared, applying chi-square test.ResultsOut of the 318 cases, 79 (25%) were Hodgkin Lymphomas (HL) and 239 (75%) were Non-Hodgkin Lymphomas (NHL). Mixed Cellularity Hodgkin Lymphoma (MCHL) was the commonest (n=48). Amongst the NHL, 215 (89.95%) were B cell lymphomas and 24 (10.05%) were T-cell lymphomas. Diffuse Large B-Cell Lymphoma (DLBCL) was the commonest lymphoma (n=165, 69.95% of NHL). Anaplastic T-Cell Lymphoma (ALCL, n=10) was the commonest T-cell lymphoma. The frequency of HLwas significantly higher in the younger age group and that of NHLwas higher in the older age group (p < 0.001). Primary lymph node involvement was reported in 175 (55%) and cervical lymph node was the most frequent site. Extra nodal involvement was seen in 93 (29%) of all cases and was reported in 87 (36.4%) of NHLand 6 (7.5%) of HL. The most common extra nodal site was the gastrointestinal tract.ConclusionHodgkin lymphoma comprises 25% and non-Hodgkin lymphoma comprises 75% of all lymphomas. Both occur in younger age groups than reported in the West. B-cell NHLis three times more common than T-cell lymphoma. DLBCLis the most frequent lymphoma. ALCLis the most common T-cell, and mixed cellularity is the most common Hodgkin lymphoma.

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