The unknown primary site was found in 72.7% (16/22) of patients with unknown primary HN cancer.

在未知原发头颈部肿瘤患者中有72.7% （16/22）检出未知的原发部位。

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The unknown primary site was found in 72.7% (16/22) of patients with unknown primary HN cancer.

在未知原发头颈部肿瘤患者中有72.7% （16/22）检出未知的原发部位。

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