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01 May 2018 : Clinical Research  

Short-Course Versus Long-Course Chemoradiotherapy for Stage IE–IIE Extranodal Natural Killer/T cell Lymphoma, Nasal Type: A Multicenter Retrospective Study

Jin Li1ABCDEFG, Yajun Li2BCE, Meizuo Zhong3AB, Xianling Liu4AB, Yinghui Song5AB, Jiwei Li1DE, Kunlun Li1DE, Pingyong Yi1ABCDEFG*

DOI: 10.12659/MSM.909506

Med Sci Monit 2018; 24: CLR2683-2692

Abstract

BACKGROUND: This study compared clinical outcomes and adverse events between L-asparaginase/pegaspargase-based short-course and long-course chemoradiotherapy in newly diagnosed stage IE–IIE extranodal natural killer/T cell lymphoma, nasal type (ENKTL).

MATERIAL AND METHODS: Patients were categorized into a short-course (2–4 chemotherapy cycles, median: 4, n=153) and long-course group (5–6 cycles, median: 6, n=83). The chemotherapy regimens included GELOX, SMILE, and VLP. The radiotherapy dose was 40–63 Gy (median: 55 Gy). Adverse events, treatment responses, and survival outcomes between the 2 groups were compared.

RESULTS: Ann Arbor stage IIE and short-course chemotherapy adversely affected overall survival (OS). Ann Arbor stage IE favorably affected progression-free survival (PFS). Grade 3–4 hematological toxicities were higher in the long-course group (25.3% vs. 14.4%, p=0.038). Ann Arbor stage was the single different clinical feature between the 2 groups, and independently affected survival outcomes. In subgroup analysis of stage IE, there was no difference in response rates and survival outcomes between the 2 groups. In subgroup analysis of stage IIE, the recurrence and death rates were significantly lower in the long-course group (6.1% vs. 23.2%, p=0.015; 12.2% vs. 39.3%, p=0.002; respectively), and the 3-year OS and PFS rates were much longer in the long-course group (87.8% vs. 62.5%, p<0.001; 83.7% vs. 57.1%, p=0.001; respectively).

CONCLUSIONS: When radiotherapy was combined with L-asparaginase/pegaspargase-based chemotherapy to treat early-stage ENKTL patients, 2–4 cycles of chemotherapy might be sufficient for stage IE patients, while stage IIE patients might require 5+ cycles.

Keywords: Drug Therapy, Lymphoma, Extranodal NK-T-Cell, Radiotherapy

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750