Nasal/nasal type NK-T-cell lymphoma is a rare and severe type of non-Hodgkin's lymphoma (NHL) more frequent in Asia than in western countries. When localised, radiotherapy seems to be the best treatment. When radiotherapy cannot be used because of dissemination or relapse, chemotherapy protocols used for other types of NHL give poor results and survival is poor. Recently papers from China and Japan reported the efficacy of a drug: l-asparaginase, usually used to treat acute lymphoblastic leukemia. In vitro a selective apoptosis of NK-cell tumours by l-asparaginase was shown on tumour cell lines and samples.