Linda is a keen gardener who keeps active by cycling 60 miles a week and also does pilates.
She says she's had "fantastic" results from the new drug, which is taken twice daily in tablet form.
The side-effects for her were minimal and it's allowed her to go on holiday to New Zealand with her husband Neil last year and plan a trip to the US this year.
"You feel the drug is working and you can be a lot calmer - it's given me nearly four years of extra time," she says.
She says the drug has also given her hope.
"It does make you think about your life, and what you want to do with your life in the future - but at least you feel well enough to make those plans and confident enough as well to fulfil some of those plans."
But not everyone is likely to have such positive results from the drug.
In trials, in 708 women, when combined with hormone therapy, the drug doubled the time the cancer took to grow, from 3.6 months to 7.3 months, and shrank tumours in 23% of patients.
"It presents a very effective option that can work for a long time - many months, and in some people it can be years," said Prof Nick Turner, lead researcher and professor of medical oncology at the Institute of Cancer Research and The Royal Marsden.
"It can substantially delay chemotherapy which many women fear because of the side-effects," he added.
"Advanced breast cancer is highly treatable and we want kinder, better treatments."
The drug, which has been approved by the National Institute for Health and Care Excellence (NICE), will be funded through the Cancer Drugs Fund in England and via health boards in Wales.