理论上，质子疗法在治疗肺癌时因可以降低辐射剂量而具优势。

There is a theoretical advantage to using proton therapy to treat lung cancer because the radiation dose to the lung will be reduced.

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评估使用质子疗法治疗儿科脑瘤患者的临床试验既不需要，而且也不可行。

Clinical trials are neither needed nor feasible to assess proton therapy use with paediatric brain tumours.

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一些临床情况需要临床试验来证明质子疗法的有效性，而另外一些情况下需要少量形式证据。

Some clinical situations require the need for clinical trials to prove the efficacy of proton therapy, while other situations need less formal evidence.

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