Research suggests there is a biological way to can restore cancer cells to normality and stop them replicating out of control. U.S. researchers have tried to add molecules called microRNAs to cancerous cells and they have found that these can put the brakes on cancer, according to a report published in Nature Cell Biology. The early laboratory tests in a dish look promising. However, it is still a long way until the first applications of these findings will be put to test in clinical trials.