The nose swallows cancerous reason

The virus of ① EB is infected.
② Environment and food:The environment factor is also a kind of reason that inducts a nose to swallow a cancer.In Guangdong, the survey discovers that big rice and aquatic trace element Nie the content lower hair area that the nose swallows cancer Gao Fa Qu is Gao.Swallow the cancer sufferer's hair in the nose in, the Nie content is as well high.The animal experiment expresses that the Nie can make the nose swallowed a cancer.Also have the report way the edible salty fish and the pickle food is a southern Chinese nose to swallow a cancer high Wei factor, and with eat the age of salty fish, eat of term, limit and cooking method relevant.
The ③ inherits a factor:The nose swallows a cancer, the patient has race and household to come together a phenomenon, if live in southern Chinese's posterity of other nations still keeps high of the nose swallow a cancerous outbreak rate, this hints that the nose swallows a cancer to be a hereditary disease.