We conducted a phase II trial of concurrent chemoradiotherapy (CCRT) followed by 2 cycles of l-asparaginase-containing chemotherapy for patients who were newly diagnosed with stages IE and IIE nasal extranodal NK/T cell lymphoma (ENKTL). CCRT consisted of 40–44 Gy of radiotherapy with weekly administration of 30 mg/m2 of cisplatin for 4 weeks. Two cycles of VIDL (etoposide (100 mg/m2), ifosfamide (1,200 mg/m2), and dexamethasone (40 mg) from days 1 to 3, and l-asparaginase (4,000 IU/m2) every other day from days 8 to 20) were administered sequentially. CCRT yielded a 90 % overall response rate without significant side effects in 30 patients, including 20 patients with complete response (CR); however, two patients showed distant disease progression. After CCRT, VIDL chemotherapy showed an 87 % final CR rate (26/30). Although grade III or IV hematologic toxicity was frequent during VIDL chemotherapy, no treatment-related mortality was observed, and l-asparaginase-associated toxicity was manageable. With a median follow-up of 44 months, 11 patients showed local (n = 4) and distant (n = 7) relapse or progression. The estimated 5-year progression-free and overall survival rates were 73 and 60 %, respectively. In conclusion, CCRT followed by l-asparaginase-containing chemotherapy is a feasible treatment for newly diagnosed stages IE/IIE nasal ENKTL.
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