A 52-year-old man from Malaysia presents with a 3-month history of left-sided cervical lymphadenopathy and unilateral serous otitis media. Nasopharyngoscopy reveals a mass in the nasopharynx, and biopsy confirms undifferentiated squamous cell carcinoma. Regarding the management and prognostic factors of nasopharyngeal carcinoma, all of the following are true EXCEPT:

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