림프절외 림프종의 WHO 분류 : 임상적 및 면역학적인 표현형의 분석 Clinical and Immunophenotypic Analysis = WHO Classification of Extranodal Malignant Lymphoma

다국어 초록 (Multilingual Abstract)

The authors retrospectively reviewed extranodal malignant lymphomas which include various distinctive clinicopathologic entities according to the new WHO lymphoma classification system. The aim of this study was to analyze the clinical characteristics of extranodal lymphomas and the relative frequency of the subtypes with immunophenotype in the Daejeon city and Chungcheong province. The authors reviewed 134 cases of extranodal lymphoma out of 220 cases of total non-Hodgkin's lymphoma which was diagnosed during the last 10 years. Among the cases, gastric lymphomas (26.1%) were the most common anatomic site. Nasal and paranasal (14.4%), skin (13.4%), and Waldeyer's tonsillar ring (11.2%) lymphomas were relatively common in order of frequency. The most frequent subtypes of extranodal lymphoma were marginal zone B-cell lymphoma of MALT (31%), diffuse large B-cell lymphoma (20%), peripheral T-cell lymphoma, unspecified (15.7%), and nasal NK/T cell lymphoma (13.4%), in decreasing order. Compared with a previous studies, the relative frequency of nasal NK/T cell lymphoma was much higher in our study than western countries and similiar to East Asia. The immunophenotype of our extranodal lymphomas was mainly B-cell type (68%) and the remaining cases were T- or NK-cell origin. In conclusion, the occurrence rates for various subtypes of extranodal lymphoma in Daejeon and Chungcheong province were distinct from those in western countries and similiar to those in East Asian countries. The most distincitive entities in our study were marginal zone B-cell lymphoma of MALT and nasal NK/T cell lymphoma. It also appears that the frequency of lymphoma subtypes is changing according to the classification system.