A group of American cancer experts did so last week.
If they did, the death rate could probably be halved, cancer experts say.
But, cancer experts said, the fact that questions remain does not to take away from the importance of the discovery.
As a result, he and other cancer experts say they are skeptical, but intrigued.
The new findings surprised the 78 cancer experts who directed the original studies.
However, cancer experts in other countries including Britain have dismissed any possible link.
But many cancer experts do challenge the researchers' interpretations of their findings.
And cancer experts say that depression can hinder treatment for some patients.
It combined those results with statistics provided by cancer experts worldwide.
Once the diagnosis is clear, a woman can follow a series of "decision trees" to find out what cancer experts would recommend.