A TEEN has tragically passed away after her back pain turned out to be a rare form of cancer.

Elisha Furneaux, 17, had just started a new job as a trainee nursery nurse and her family thought that might be to blame for her pain.

But after it refused to settle down, they took Elisha, from Gwynedd, Wales, to their GP who prescribed her painkillers.

And after they didn't seem to work, medics decided that the teen should have an X-ray to find out exactly what was going on.

Just two weeks after turning 17, she collapsed at home and became paralysed from the waist down.

Her results confirmed that Elisha didn't have a slipped disc or a back injury - she had a rare form of cancer called undifferentiated soft tissue sarcoma.

Six-and-a-half months later, Elisha was dead.

Heartbroken mum Emma said: "Before she got the results from the X-ray, Elisha collapsed at home as the tumour had broken through her vertebrae and was in her spine.

"Everyone was so shocked and in disbelief. You just don’t expect cancer when your child has been fit and healthy and a normal 17-year-old.

"Apart from a bit of a bad back that we put down to where she was working, Elisha had no other symptoms."

By the time Elisha was diagnosed, it had spread to her lungs, kidney and pelvis.

Emma said: "The initial word 'cancer' devastated our lives.

"You come out of it as a completely different person and you never get back to the person you were.

"One day everything was fine, everything was great, then the next we came home and it had all changed and there had been no warning."

The teen, who had been studying for an NVQ in childhood studies, spent a month in hospital in Cardiff after her diagnosis, before being moved to the Alder Hey hospital in Liverpool.

And during that traumatic time, Elisha's family were supported by CLIC Sargent, the UK’s leading cancer charity for children and young people.

They enabled Elisha to return home for her final five weeks.

"Throughout Elisha’s illness we received incredible support from CLIC Sargent," said Emma.

"They made a tremendous difference to us as a family and helped us walk through the most difficult of times."

To make sure other families get to benefit from the service, Emma is now running the London Marathon for CLIC Sargent.

She added: "It is too late for us but if it can help another child, if it can help another family, then it has been worth it."