Tiny Livers, Tiny Steps

... mains a concern for the tiny "liverettes" as stem cells have been known to form tumors. The potential for stem cell research stands to advance in great leaps and bounds in the coming years. As such, professionals have guarded optimism.

http://community.advanceweb.com/blogs/mt_1/archive/2013/07/11/tiny-livers-tiny-steps.aspx