US scientists have developed a new vaccine that has the potential to cut the disease by 70 per cent, thereby offering new hope to millions of women suffering from breast cancer.
The jab will be tested on humans next year.
It works by boosting the immune system, which attacks a protein called alpha-lactalbumin that occurs in most breast cancers.
By destroying every trace of it, the tumours don't develop and existing ones are shrunk by up to half.
The drug has been tested on rodents prone to breast cancer and they never developed the disease.
"We believe this will some day be used to prevent breast cancer in adult women in the same way that vaccines have prevented many childhood diseases," the Sun quoted Dr Vincent Tuohy of the Cleveland Clinic in Ohio, US, who created the vaccine, as saying.
"If it works in humans the way it works in mice, this will be monumental," he added.
Dr Caitlin Palframan, from Breakthrough Breast Cancer, said: "We look forward to seeing the results of large-scale clinical trials to find out if this vaccine would be safe and effective in humans."