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[Case series of localized nasal NK/T-cell lymphoma treated with preceding intensified local radiation therapy before systemic chemotherapy].

Nasal NK/T-cell lymphoma is EB virus-associated aggressive lymphoma, which is more prevalent in Asia. Previously, this lymphoma which was recognized as lethal midline granuloma, commonly presents with midline facial destructive lesions. In early stage I/II disease, radiation therapy exerts a powerful treatment outcome, however, toxic adverse events are indispensable and the tolerability of radiation therapy with chemotherapy has not been fully studied. It is imperative to offer an appropriate treatment for cure of this disease. We report consecutive 4 cases of nasal NK/T-cell lymphoma, which was treated with 56 Gy intensified local radiation therapy followed by systemic chemotherapy. Two cases complicated with grade 3 stomatitis during the treatment course and 3 cases were hospitalized due to the decrease of oral intake. The scheduled radiation chemotherapy was completed and resulted in complete response of disease in all cases. High intensified radiation therapy followed by chemotherapy may be effective for localized nasal NK/T-cell lymphoma.