Several types of cancers in men are characterized by peak incidence in reproductive (20-40 years), pubertate (12-19 years) and prepubertate (<12 years) periods of development, thus occuring before a patient can realize his reproductive function.The most common of these malignancies are testicular tumors, lymphomas, and leukemias.Given the appropriate treatment modalities which are currently available, patients suffering from these tumors can achieve good or excellent oncologic prognosis, 5-year overall survival rate exceeding 90%, the majority of patients cured with the treatment.Meanwhile, the malignancies themselves or applied treatment options (surgery, chemo-and radiotherapy) significantly damage patients fertility, chiefly affecting spermatogenesis, but in some cases extending to testosterone production and ejaculation.Therefore, its an issue of crucial importance to consider and apply necessary options of preserving fertility before starting the treatment, as well as to offer possible methods of fertility restoration in case it was affected.