HD setups maintained the spermatogonial and Sertoli cells in vitrified–warmed adult goat testes [12]; increased OCT4(+), Ki67(+) and AP2-gamma(+) proliferative spermatogonial progenitor cells in gestational 7–12 week human fetal testis [43]; sustained Ki67 and BrdU(+) proliferative GCs with no increase in cCaspase3(+) apoptotic cells from adult human healthy and cancer testicular samples [14] up to 14 days. This evidence concerns the gene MKI67 and cancer.