A teenage cancer patient who was repeatedly given large overdoses of radiation has died, it was confirmed today.

Lisa Norris, 16, was given 17 overdoses of radiation therapy during her treatment for a brain tumour at the Beatson oncology centre in Glasgow in January.

It was reported she died yesterday at her home in Ayrshire, surrounded by her family.

In the weeks before her death Lisa had been recovering from surgery to remove fluid from her brain. She underwent the procedure last month after weeks of feeling ill.

Human error was blamed for the radiation overdose, which left Lisa with burns on the back of her neck and head.

Doctors warned the teenager that the blunder could cause long-term brain damage, leading to paralysis and even premature death.

A Scottish Executive Health Department inquiry into the overdose at the oncology centre, which is run by NHS Greater Glasgow and Clyde, is continuing.

The health board's chairman, Sir John Arbuthnott, said today that staff were "extremely upset" at Lisa's death.

"I have passed on my condolences to the family on behalf of the whole organisation," he said.

"We know this will be a tragic loss for the Norris family and our staff will do whatever they can to support them at this difficult time."

Lisa's father, Ken, 51, told the Daily Record newspaper he blamed the radiation overdose and not the cancer for her death.

"We remain convinced it was the overdoses that did this, not the cancer," he said.

"She was determined not to give up her fight and she stayed fighting until the end. That's my Lisa."

Her mother, Liz, said Lisa would remain in the family's hearts forever, and that she was a "very special girl".

Lisa was initially diagnosed with a brain tumour in October last year.

She began radiation therapy on January 5 after four blocks of chemotherapy at Yorkhill hospital.

The radiation overdoses followed afterwards, during her treatment at Beatson.

Staff told her about the error as they delivered the news that her tumour had gone.

At the time the medical director at Beatson, Alan Rodger, said his staff were "distraught" over what had happened.

He said then that initial findings indicated the overdose was the result of human error and no other patients were affected.

After being told about the overdose, Lisa spoke of her uncertainty about the future. She had to have extensive oxygen treatment to try to combat the mistake.

"We don't know what's in the future because I could be brain-damaged, I could be paralysed," Lisa said at the time.

"Later in the future, in 10 to 15 years, I could not be here.

"It's just time will tell if anything is going to happen." In September, Lisa was taken to Glasgow's Southern General hospital for a two-hour operation to remove some fluid from her brain. She was reportedly back on her feet within a week of the surgery.