This study was purposed to explore the clinical characteristics, therapy and prognosis of patients with extranodal NK/T cell lymphoma (ENKL). 47 patients with ENKL from October 1995 to December 2008 in our hospital were analyzed retrospectively. The survival of patients was analyzed by using Kaplan-Meier methods, the prognosis of patients was evaluated by multivariate analysis using COX regression model. The clinical parameters used included CD56, Ann Arbor stage, international prognostic index (IPI) and B symptom. The results showed that the 2-year and 5-year overall survival (OS) rates were 91%, 71% respectively. Multivariant analysis by COX regression showed the CD56 and Ann Arbor stage were independent prognostic factors. Single factor analysis with staging in CHOP chemotherapy group indicated that more than stage IIIE (including IIIE) was a prognostic factor. Single factor analysis with B symptom showed that B symptom also was a prognostic factor. The cumulative survival rate of patients received radiotherapy alone was higher than that of patients got chemotherapy alone, its difference had a statistical significance, but there was no statistical significance between radiotherapy group and chemoradiotherapy group. It is concluded that CD56, Ann Arbor stage and B symptoms are prognostic factors. Radiotherapy alone is better than chemotherapy alone in therapy of ENKL. Chemotherapy combined with radiotherapy can not improve the survival. Improving the status of patients can make prognosis better.
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