Two studies conducted in Madrid Spain were conducted and showed favorable data in the use of marijuana for the treatment of both breast cancer and the treatment of tumors. The first study conducted used laboratory rats, in which researchers were able to destroy incurable brain tumors. The study was conducted in February 2000 and was later published in the journal Nature Cancer Review. The main problem for these researchers in Madrid was the government in Spain did not want the favorable medical marijuana data shown to the public.
The second study also showed favorable evidence in the treatment of breast cancer treatment with medical marijuana and its active compound THC. This study was also not carried by any news agency in Spain or in the United states even though the researchers had evidence that the use of medical marijuana could treat these cancerous conditions favorably.