A new study finds high dose injections of vitamin C can reduce cancerous tumors by half.

And what's more -- the treatment does not harm healthy cells, meaning there are fewer difficult side-effects, often experienced with traditional cancer treatments like chemo and radiation.

Go home and die. That's what doctors told 59 year old Arlindo Olivera.

His lung cancer was so advanced, it had spread to his brain and doctors said there was nothing they could do.

Today, Arlindo is cancer free.

Arlindo believes his cancer is gone because of vitamin C treatment.

Dr. Scott Greenberg says he has successfully treated many people with vitamin C infusions, including Arlindo.

Some doctors believe vitamin C treatment works by killing the cancer cells.

Researchers at the national institutes of health say it may also work as an anti-oxidant protecting cells from the damage of free radicals.

The national institutes of health study treated mice with aggressive brain, ovarian and pancreatic tumors.

Tumor growth and weight was reduced by 41 to 53 percent and the brain cancer stopped spreading.

Doctor Greenberg says it only works in very high intravenous doses and can be used along with traditional chemo and radiation.

He says it's a valuable option for those who don't respond to other treatment.

Arlindo continues to be cancer free.

The treatment is not covered by insurance, but costs considerably less than standard chemotherapy or radiation.

It's about $125,000 per treatment versus several thousand dollars.