Assertion: radiation's effect | /r/HasProperty | undemonstrated
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Source sentences:
text: He stressed that radiation had the effect of making many cancers worse, many doctors thought the belief that radium could be used to cure cancers at that stage of the development of therapy was a "delusion" — one doctor quoted cited a failure-to-success rate of 100 to 1 — and the effects of radium water were undemonstrated.