Nasopharyngeal carcinoma (NPC) is a rare cancer arising from the nasopharynx epithelium, and its geographical distribution is extremely unbalanced. In total, 86,500 cases of NPC were reported in 2012, and 71% of new cases were in the east and southeast parts of Asia, with south-central Asia, and north and east Africa accounting for the remainder [1]. Due to the anatomical constrains and highly radiosensitive nature of NPC, surgery is inappropriate and radiotherapy is the only curative treatment of choice for non-disseminated disease.
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