http://www.moneytrendsresearch.com/scientists-cure-cancer-but-no-one-takes-notice/
Canadian scientists have discovered a shockingly simple cure for cancers, including lung, breast, and brain cancers. It utilizes "dichloroacetate", a medicine which is currently being used to treat metobolic disorders. The drug doesn't require a patent, is cheaper, and is easier to distribute than other drugs. However, seemingly because of these virtues, large drug companies are not jumping on the band wagon. A large sum of money can't be made because the drug cannot be privately patented.
See the article above for more information, also linked
here.