I heard of it being a risk factor, Uptown, salty fermented foods too. I met one patient last year at a SPOHNC meeting. In addition, Epstein Barr Virus, EBV, and now
HPV is being implicated more than thought when it was originally thought to be an extension of oropharynx cancer, maybe not always.
http://www.infectagentscancer.com/content/8/1/30http://www.cancer.med.umich.edu/:/news/nasopharyngeal-cancer09.shtml