Experts are debating whether terminally ill patients should have the right to try out new drugs that have not completed safety checks.
The US is currently considering allowing such a move.
Professor Emil Freireich of the University of Texas says patients should be allowed to judge the risks.
But US medical oncologist Dean Gesme told the British Medical Journal that to allow this could harm both individuals and science.
Human guinea pigs
In the US, the Food and Drug Administration has proposed expanding access to investigational drugs for patients with terminal illnesses after initial safety - phase I - trials but before final approval. However, Dr Gesme, who works for the Minnesota Oncology Haematology Professional Association, points out that more than 90% of drugs entering phase I trials are found unacceptable.
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