Hormones produced by the heart have been used to cure cancers in mice.
The discovery could pave the way to new human cancer treatments - which may affect life insurance policies for people suffering from the disease.
Scientists in America claim to have eliminated human pancreatic cancer in more than three-quarters of mice treated with the hormones and eliminated human breast cancer in two-thirds of the mice, reports Medical News Today.
A private biotechnology company is reported to be raising funds to begin human trials of the treatment.
The pancreatic cancers that were not cured were reduced to less than ten per cent of their original size.
None of the mice died of cancer and none suffered any side effects.
Dr David Vesely, from the James A Haley Veterans Hospital in Tampa, will present his research at the Experimental Biology 2008 conference in San Diego, on April 9th.
Hormone therapy is used in the UK to treat breast, prostate and womb cancers.
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