It's hard to uproot deeply held beliefs about cancer screening with scientific data.

很难用科学数据来根除人们对癌症筛查根深蒂固的观念。

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Scientists say the compound is likely to cause cancer but have no hard scientific proof.

科学家们称这种化合物可能致癌，但是并没有确凿的科学依据。

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People don't know there is an epidemic of cancer of the oesophagus, for example, which is very hard to treat.

比如，人们还不知道现在正流行食管癌，而这一病症是非常难以治疗的。

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An experimental Pfizer (nyse: PFE - news - people ) pill shrank thyroid tumors, another hard-to-treat cancer.

FORBES: Quiet Times At Biotech's Big Show

And then she designed a device that uses light to kill hard-to-reach cancer cells while leaving the healthy ones untouched.

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An experimental Pfizer pill shrank thyroid tumors, another hard-to-treat cancer.

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