OBJECTIVETo compare the short and long term clinical efficacy for treatment of patients with extranodal nasal-type NK/T-cell lymphoma(ENKTL) by intensity modulated radiotherapy(IMRT) and conventional radiotheraphy(CRT).

METHODSSixty-three cases of early ENKTL were divided into the IMRT group of (33 cases) and CRT group(30 cases). The short effects, overall survival(OS) of 3 years, progression free survival(PFS) of 3 years, acute radiation injury and late adverse reactions to radiation were compared between 2 group.

RESULTSThe rate of overall response rate(ORR) were not significantly between the 2 groups(P>0.05); the OS of 3 years and PFS of 3 years were not different significantly between the 2 groups(P>0.05); the OS of 3 years and PFS of 3 years were not different significantly between the chemotherapy and non-chemotherapy group(P>0.05); the incidence and severity of oral mucosa reaction, myelosuppression, skin reaction and dry mouth were not significantly different between the 2 groups(P>0.05); the incidence of late dry mouth and swallowing obstruction feeling in the IMRT group were significantly lower than those in CRT group (P<0.05); the rate of late hearing loss, visual loss and mouth openin restriction were not different between the 2 groups(P>0.05).

CONCLUSIONThe short and long term clinical efficacy of IMRT and CRT for the patients with ENKTL is the same; however, the adverse radiation reactions of IMRT are lower, showing a positive significance for improvment of prognosis improving.