In the new study, however, researchers were able to take cells from men's testicular tissue, isolate stem cells, and turn them into insulin-secreting islet cells.

Hundreds of cancer patients worldwide have ovarian tissue and testicular tissue frozen in the hope of being able to have children once their treatment has finished.

All of this holds true for testicular tissue, too, although we are not so advanced in successfully removing, storing and transplanting testicular tissue as we are with ovarian tissue.