The singer and actress spent years raising money to fund cancer research.
Breast Cancer UK head Thalie Martini said the Grease star had left an "incredible legacy".
The charity was "particularly grateful for Oliva Newton-John's commitment to awareness raising of this devastating disease". If people were more aware of the early signs of breast cancer, 17,000 lives could be saved in the UK each year, it said.
, there is no scientific proof cannabinoids can treat cancer - but research is continuing in the UK and around the world. Newton-John also advocated herbal remedies, used holistic treatments such as acupuncture and massage therapy alongside treatment and
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