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Comparative analysis of extra-nodal NK/T-cell lymphoma and peripheral T-cell lymphoma: significant differences in clinical characteristics and prognosis

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Aim: We aimed to compare the frequencies, clinical characteristics, and prognostic factors of peripheral T-cell lymphoma (PTCL) vs. extra-nodal natural killer (NK)/T-cell lymphoma and to characterize the subtypes of extra-nodal NK/T-cell lymphoma. Methods: We reviewed 97 consecutive patients with PTCL and extra-nodal NKT lymphoma from 2000 to 2006. During this period, a total of 780 patients with malignant lymphomas were treated in our center. The diagnostic criteria used were based on the WHO classification system of malignant lymphomas. Results: Extra-nodal-NK/T-cell lymphoma and PTCL comprised 5.0% (39/780) and 7.4% (58/780) of all cases. Of the PTCL cases, histology was PTCL-NOS in 25, anaplastic large cell in 11, angioimmunoblastic T cell in 18 and other subtypes in four patients. Compared with PTCL, extra-nodal NK/T-cell lymphoma was associated with a significantly inferior rates of complete remission (33% vs. 53%, P = 0.05) and 3 yr overall survival (29.5% vs. 47.5%, P = 0.003). On multivariate analysis, extra-nodal NK/T-cell histology was independently associated with decreased survival. Further analysis into this subtype showed the nasal variant (n = 25) differed significantly from extra-nasal variant (n = 14) in terms of stage at presentation (stages III/IV, 36% vs. 79%), international prognostic index scores (high intermediate or high IPI scores, 24% vs. 64%), complete remission rates (48% vs. 7%), and median survival (10 months vs. 1 month, P < 0.0001). Conclusions: Extra-nodal NK/T-cell lymphoma was associated with a poorer prognosis compared with PTCL and is likely to comprise two distinct variants with different clinical behavior and prognosis.
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Keywords: characteristics; extra-nodal NK/T-cell lymphoma; peripheral T-cell lymphoma; prognosis

Document Type: Research Article

Affiliations: 1: Department of Medical Oncology, National Cancer Centre 2: Clinical Trials and Epidemiological Sciences, National Cancer Centre 3: Department of Hematology, Singapore General Hospital 4: Department of Radiation Oncology, National Cancer Centre 5: Department of Pathology, Singapore General Hospital, Singapore

Publication date: January 1, 2008

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