The largest tumor may need examination through an Onco Type DX -- a gene analytical test of the actual tumor itself that helps to predict the benefits of chemotherapy plus anti hormone therapy vs. anti hormone therapy alone. It helps to predict the benefit of chemo in your mother's situation.
For more on the test, visit genomichealth.com.
Also, the full body scan that's going to be done at the Imperial College of London can only detect macroscopic disease, meaning the disease that's 2 to 3 mm or greater in size. It cannot detect microscopic disease.
Yes, your mom does need to have her whole body treated. The minimal therapy would be the anti-estrogen and the maximum therapy would be the anti-estrogen and chemo together.