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Pioneering new drug treatments are looking promising in how many cancers are treated.

The Â鶹Éç’s Panorama programme spent 18 months following a group of patients at the Royal Marsden Hospital. They are being treated with drugs which target the specific genetic mutations which drive cancer growth.

One of them is 11-year-old Sophie Armitage, who was diagnosed with a rare and apparently untreatable tumour in 2012.

Dad Tom said the tumour in Sophie's lung was originally "plum-sized" but has now shrunk to the "size of a pea" after taking pioneering drugs for 18 months.

He described the drug as "science fiction stuff" which has allowed Sophie to live as "otherwise a normal child."

This clip is originally from 5 live Breakfast on February 11 2015.