Terrible title. In addition to the article saying nothing about a "cure" (as jinushaun pointed out), the substance in question was found a long time ago. What was actually found were the genes responsible for producing it. The "heroin plant" is what most people call an opium poppy. Heroin is a synthetic drug made using morphine as one of the precursors -- opium poppies contain no heroin per se. Cancer cure -> wrong. Found -> wrong. "Heroin plant" -> wrong.
Oops, probably shouldn't have been eradicating the poppy crop in Afghanistan, then<p>Actual article: <a href="http://www.reuters.com/article/2012/05/31/us-medicine-poppies-idUSBRE84U11N20120531" rel="nofollow">http://www.reuters.com/article/2012/05/31/us-medicine-poppie...</a>