“It took us about 20 years of research to figure this out, but we are very excited,” said Pierre Desprez one of the California Pacific Medical Center scientists behind the discovery. “We want to get started with trials as soon as possible.”

The finding has already undergone both laboratory and animal testing, and is awaiting permission for clinical trials in humans, reports the Huffington Post.

Desprez, a molecular biologist, spent yers studying ID-1, the gene that causes cancer to spread. Meanwhile, fellow researcher Sean McAllister was studying the effects of Cannabidiol, or CBD, a non-toxic, non-psychoactive chemical compound found in the cannabis plant. Finally, the pair brought their work together.

“What we found was that his Cannabidiol could essentially ‘turn off’ the ID-1,” Desprez told HuffPost. The cells stopped spreading and returned to normal.

“We likely would not have found this on our own,” he added. “That’s why collaboration is so essential to scientific discovery.”

“We started by researching breast cancer,” said Desprez. “But now we’ve found that Cannabidiol works with many kinds of aggressive cancers–brain, prostate–any kind in which these high levels of ID-1 are present.”

Desprez hopes that clinical trials will begin immediately.