The etiology of nasopharyngeal carcinoma (NPC) is multi-factorial, including latent infection of Epstein-Barr Virus (EBV), environmental factors, dietary habits, familial heredity etc.

鼻咽癌的发生是多种病因通过多种途径共同参与的过程，其中包括EB病毒感染、地域环境因素影响、饮食习惯以及家族遗传等。

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PHC showed familial aggregation. The correlation between siblings was significant and was influenced by the HBV infection.

肝癌具有家庭聚集性，主要表现为同胞间的相关，且受HBV感染的影响。

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Conclusion: HB has a certain character of familial assemblage. Contact in daily life is the main way of infection of hepatitis b.

结论：乙肝有一定的家庭聚集性，日常生活接触已成为乙肝主要的传播途径。

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