An Australian scientist has given details of his research into a skin cancer vaccine at a medical research conference in Brisbane.
Ian Fraser says the vaccine has been successful in animal testing and could be available to the public within five to 10 years.
Professor Fraser says the vaccine prevents the cancer by producing killer T-cells.
Meanwhile, a study in the United States has found that taking vitamin C or E supplements has no effect on reducing the risk of developing cancer.
Researchers from Harvard Medical School tracked a group of 15,000 men, with an average age of 64, over eight years.
The scientists found there was no difference in cancer rates between those who took the vitamins and a control group taking dummy pills.