This problem has been cheerfully ignored for a long time - http://discovermagazine.com/2014/nov/20-trial-and-error http://discovermagazine.com/2014/nov/20-trial

This problem has been cheerfully ignored for a long time - http://discovermagazine.com/2014/nov/20-trial-and-error http://discovermagazine.com/2014/nov/20-trial-and-error : > In June 2007, all that changed. Ain attended the annual Endocrine Society meeting in Toronto, where Bryan Haugen, head of the endocrinology division at the University of Colorado School of Medicine, told Ain that several of his most popular cell lines were not actually thyroid cancer. One of Haugen’s researchers discovered that many thyroid cell lines their laboratory stocked and studied were either misidentified or contaminated by other cancer cells. [...] > But rampant contamination is not the shocker in this story. Ain retired all the lines; he never sent any of them out again. He also sent letters to 69 investigators in 14 countries who had received his lines. He heard back from just two.