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A London hospital's trial of a prostate cancer drug has been stopped early because it was so successful doctors felt it would be "unethical" to deny the treatment to other patients.
Medics halted tests of the life-extending drug because it would have been "unethical" not to offer the treatment to all 922 cancer sufferers taking part in the trial.
Patients who were given the drug found that it eased pain and caused only minor side effects.
The new drug accurately targets tumours using alpha radiation, which doctors conducting the study said is the most effective form of radiation to eliminate cancer because it limits damage to surrounding tissue.
"It would have been unethical not to offer the active treatment to those taking placebo," Dr. Parker said.