Spermatogonial Stem Cell (SSC) Transplant and Testicular Tissue Grafting

Inclusion Criteria:

* Male participant at least in Tanner stage 3
* Previously cryopreserved and stored testicular tissue/cells (frozen due to an infertility-risking diagnosis or treatment such as chemotherapy or radiation) available for autologous transplantation and grafting
* Healthy enough to undergo anesthesia
* Written clearance for the procedure from the patient's hematologist or oncologist to confirm the patient has finished treatment for primary condition and are clear to undergo autologous stem cell transplant

Exclusion Criteria:

* Participants considered to be high risk for surgical complications
* Participants with a history of leukemia, lymphoma or testicular cancer or a cancer that likely involved testicles at the time of testicular tissue collection
* Diagnosed with psychological, psychiatric, or other conditions which prevent giving fully informed consent.