Drug companies weren't willing to test a drug they could not patent,

The drug dichloroacetate (DCA) has finally finished its first clinical
trial against brain tumours in humans. Drug companies weren't willing
to test a drug they could not patent, so money was raised in the
community
through donations, auctions, and finally government support, but the
study was still limited to five patients, showing extremely positive
results in four of them. It also raises the question of where all the
money donated to Canadian and other cancer societies, and especially
the
billions spent buying merchandise with little pink ribbons on it goes,
if not to actual cancer research like this."