The term medical marijuana took on dramatic new meaning in February 2000 when researchers in Madrid announced they had destroyed incurable brain cancer tumors in rats by injecting them with THC, the active ingredient in cannabis.
The Madrid study marks only the second time that THC has been administered to tumor-bearing animals; the first was a Virginia investigation 48 years ago. In both studies, the THC shrank or destroyed tumors in a majority of the test subjects.
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