Herceptin would be an example of a treatment that's targeting one of these molecular machines, and it can be effective when it's relevant in a patient's breast cancer. We need to know more of those kinds of molecular targets. As you know, Dr. Hartmann, the daughters of women who have breast cancer are often worried that they may, in turn, develop the disease. Yes, we are learning so much more than we used to know. Certainly, one case of breast cancer in a family does not make a hereditary syndrome.
Breast cancer is a common disease, so it can happen within a family in that way.
So that tells us there's something going on in this family that conveys a predisposition to breast cancer. It is thought that perhaps ten percent of all breast cancer may be on a hereditary basis. So it's a real proportion, but it's a small proportion. I think colon cancer, the same kind of number is projected. Tamoxifen is the most prescribed treatment in breast cancer and there has been a lot of new information on this therapy.