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Many people have seen - and shared - an article online with the catchy headline, "Scientists cure cancer, but no one takes notice."

Surely if a cure for cancer had been discovered, people would notice, right?

The link being circulated via Facebook and other social media sites is to a poorly-written HubPages article which states, "Researchers at the University of Alberta, in Edmonton, Canada have cured cancer last week, yet there is a little ripple in the news or in TV. It is a simple technique using very basic drug. The method employs dichloroacetate, which is currently used to treat metabolic disorders. So, there is no concern of side effects or about their long term effects."

The claim that a cancer cure had been discovered was based largely on two press releases from the University of Alberta, three years apart.

The original news from the University of Alberta was actually released in 2007; click here to read the full text. Here's a brief excerpt:

Dr. Evangelos Michelakis, a professor at the U of A Department of Medicine, has shown that dichloroacetate (DCA) causes regression in several cancers, including lung, breast, and brain tumors.

"This preliminary research is encouraging and offers hope to thousands of Canadians and all others around the world who are afflicted by cancer, as it accelerates our understanding of and action around targeted cancer treatments," said Dr. Philip Branton, Scientific Director of the CIHR Institute of Cancer.

The university published an update in May 2010, which reads in part:

No conclusions can be made on whether the drug is safe or effective in patients with this form of brain cancer, due to the limited number of patients tested by the study's leads Drs Michelakis and Petruk. Researchers emphasize that use of DCA by patients or physicians, supplied from for-profit sources or without close clinical observation by experienced medical teams in the setting of research trials, is not only inappropriate but may also be dangerous.

Biology professor PZ Myers said in May 2011 of the "cancer cure" claim:

"The simple summary is this: that claim is a lie. There have been no clinical trials of dichloroacetate (DCA) in cancer patients, so there is no basis for claiming they have a cure; some, but not all, cancers might respond in promising ways to the drug, while others are likely to be resistant (cancer is not one disease!); and there are potential neurotoxic side effects, especially when used in conjunction with other chemotherapies."

Myers goes on to say:

We should be urging further investigation of this promising drug with the beginning of clinical trials, but it's far too early to be babbling about "cancer cures". There have been lots of drugs that look great in the lab and have excellent rationales for why they should work, but the reality of cancer is that it is complicated and diverse and there are many more pitfalls between a drug that poisons cancer cells in a petri dish and a drug that actually works well in the more complex environment of a human being.