(Thanks to Israel21c) Dr. Karen Tordjman of Tel Aviv University discovered a new genetic mutation in a sterile Androgen Receptor Insensitivity sufferer. She then used a treatment that theoretically had no hope, but within two years led to him successfully father three children.
http://israel21c.org/health/israeli-doctors-push-the-limits-of-male-fertility/
http://www.ncbi.nlm.nih.gov/pubmed/23808476