• Testicular tissue freezing typically used by prepubertal boys
• Testicular tissue freezing involves removing a small piece of testicular tissue and freezing it at very low temperatures (cryopreservation)
• The tissue is stored with the long-term goal of using it to restore fertility
• The tissue contains spermatogonia stem cells (SSCs)—the early cells that develop into mature sperm after puberty

Other Methods of Preserving Fertility Before Starting Treatment