The study is designed to compare Intensity Modulated Radiotherapy (IMRT) in combination with concurrent chemotherapy and IMRT alone in treatment of stage II nasopharyngeal carcinoma.

Nasopharyngeal carcinoma (NPC) is endemic in Southern China, Southeast Asia, the Arctic, and mid-East/North Africa. NPC prevalence is reported to be highest in southern China, where an average of 80 cases per 100,000 population are reported each year. It is both radiosensitive and chemosensitive. The National Comprehensive Cancer Network (NCCN) guidelines (version 1, 2013), have recommended use of concurrent chemoradiotherapy (CCRT) with or without adjuvant chemotherapy (AC) as standard treatment for NPC.

Recently, the technique of IMRT has become widely used in the treatment of nasopharyngeal carcinoma. The preliminary results showed that IMRT might improve the rate of local control and the quality of life in NPC. In a retrospective study (Ivan,2010), the result showed that IMRT without concurrent chemotherapy provides good outcome for patients with stage IIB NPC with acceptable toxicity. Another study showed that Comparing with IMRT alone, IMRT in combination with chemotherapy provided no significant benefit to locoregionally advanced NPC (Su,2011). With IMRT, it was unclear whether the additional of concurrent chemotherapy was essential for stage II nasopharyngeal carcinoma.

The investigators designed the present study to research the role of adding concurrent chemotherapy to intensity modulated radiotherapy in the treatment of stage II NPC. The primary endpoint is failure-free survival (FFS).The second endpoints were overall survival (OS),loco-regional failure-free survival (LFFS), distant metastasis failure-free survival (DMFS), and acute and late adverse events.

Inclusion Criteria:

• Patients with newly histologically confirmed non-keratinizing (according to WHO histologically type).
• 18 Years to 70 Years
• Tumor staged as T1-2N1/ T2N0 (according to the 7th AJCC edition),No evidence of distant metastasis (M0)
• Satisfactory performance status: Karnofsky scale (KPS) > 70 (Appendix I ).
• Adequate marrow: leucocyte count > 4×109/L, neutrophil count > 2×109/L, hemoglobin > 90g/L and platelet count > 100×109/L
• Normal liver function test: Alanine Aminotransferase (ALT), Aspartate Aminotransferase (AST) < 1.5×upper limit of normal (ULN) concomitant with alkaline phosphatase (ALP) < 2.5×ULN, and bilirubin < ULN
• Adequate renal function: creatinine clearance > 60 ml/min
• Patients must be informed of the investigational nature of this study and give written informed consent

Exclusion Criteria:

• WHO Type keratinizing squamous cell carcinoma or basaloid squamous cell carcinoma.
• Age > 60 or < 18.
• Treatment with palliative intent.
• Prior malignancy except adequately treated basal cell or squamous cell skin cancer, in situ cervical cancer.
• Pregnancy or lactation (consider pregnancy test in women of child-bearing age and emphasize effective contraception during the treatment period).
• History of previous RT (except for non-melanomatous skin cancers outside intended RT treatment volume).
• Prior chemotherapy or surgery (except diagnostic) to primary tumor or nodes.
• Any severe intercurrent disease, which may bring unacceptable risk or affect the compliance of the trial, for example, unstable cardiac disease requiring treatment, renal disease, chronic hepatitis, diabetes with poor control (fasting plasma glucose > 1.5×ULN), and emotional disturbance.