Stephens analyst Rick Nelson expects Lumber Liquidators shares to give up the gains they'd experienced since the Centers for Disease Control report on February 10 after the CDC updated to explain that they had previously understated the risk of cancer related to its floorings. The CDC earlier used an incorrect value to calculate the ceiling height and said the revised results were preliminary, the analyst noted. Shares of Lumber Liquidators, which had advanced about 17.5% from February 10 until Friday, are down over 16% in pre-market trading to $11.85.