Nasopharyngeal Carcinoma:

Origin:

nasopharyngeal epithelial cell

 Region:

Guangdong, South China

 Ages:

40-59 y, males > females

 Affected sites：

  1.   commonly seen in the roof of nasopharynx
  2.   lateral wall
  3.   lateral pharyngeal fossa (Rosenmuller’s cavity)

Etiology:

  • Environment:
—-polycyclic aromatic hydrocarbon, nitrosamine

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