ObjectiveHypopharyngeal carcinoma is a common malignant tumor in head and neck , invasion and metastasis are responsible for the high death rate.

下咽癌是头颈部较常见的恶性肿瘤，恶性度较高，多浸润生长、易转移，而浸润和转移是下咽癌致死的主要原因。

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About half of the patients with malignant tumor in head and neck could obtain long term survival through radiotherapy or other therapy combined with radiotherapy.

通过放疗以及放疗参与的多学科综合治疗能使约半数头颈部恶性肿瘤患者获得长期生存的机会。

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ObjectiveNasopharyngeal carcinoma is a common malignant tumor in head and neck, invasion and metastasis are responsible for the high rate of mortal.

目的鼻咽癌是头颈部常见的恶性肿瘤，而浸润和转移是鼻咽癌致死的主要原因。

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