Objective : To explore the pain relief effect with a single and multifraction radiotherapy for bone metastases.

目的: 研究单次放射治疗与多次分割放射治疗对于骨转移性疼痛止痛效果.

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Objective To observe the pain relief effect with conventional fraction and hypofraction radiotherapy for bone metastases.

目的观察骨转移癌常规分割放疗组与低分割放疗组的止痛效果.

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