As many as 5,000 women a year with hormone-sensitive breast cancer could benefit

Karen Bonham was part of successful trial for genomic test that determines which women with breast cancer can safely avoid chemotherapy

Trial suggests patients with a low test score could be treated with hormone therapy alone with near-identical outcomes

Doctors said the test shows people with certain forms of the disease can safely avoid chemotherapy

As many as 5,000 women a year with hormone-sensitive breast cancer could benefit