Currently, there is no way to determine which smokers are most likely to develop lung cancer.
2
由于癌细胞具有难以预测的本性，治疗如肺癌、乳腺癌和肝癌这些主要杀手的方法依然是重大的难题。
Cures for the major killers, such as cancers of the lung, breast and liver, remain elusive primarily because of the unpredictable nature of cancer cells.
3
对于两种类型的肺癌，分期的方法也不一样。
There are different systems for the two main types of lung cancer.
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