I'm not saying implants protect against breast cancer. It has to do with the characteristics of the women.

We do know reproductive and demographic factors do influence (breast cancer) risk. If you're thin -- women who get these implants are typically quite thin -- you have kids early, you have a lot of (kids) ... all those things lower your risk.

The reason this study is so important is because it's the longest follow-up study of cancer in women with breast implants. There needs to be enough time between exposure and cancer development.

They have the best cancer registries in the world, going back almost 50 years.

We do know reproductive and demographic factors do influence (breast cancer) risk.

Women with silicone breast implants should feel reassured.