Breast self-examination is invaluable for detecting cancer in its very early stages.

乳房自检对早期癌症的发现很有价值。

《柯林斯英汉双解大词典》

But the group recommends against teaching women breast self-examination.

VOA: special.2009.11.18

Monthly self-examination has been abandoned in favor of breast awareness after several clinical trials showed that monthly self-examination did not save lives.

CNN: Should I get a mammogram?

Breast awareness is very different from the monthly breast self-examination that was once advocated.

CNN: Should I get a mammogram?