Fertility preservation in men with hypogonadotropic hypogonadism secondary to germinoma: two cases of gonadotropin replacement therapy before induction of anticancer chemotherapy.

Hypogonadotropic hypogonadism can be caused by brain tumors. For a malignancy such as a germ cell tumor, chemotherapy combined with radiation is administered. In patients who wish for children, the inability to undergo sperm cryopreservation before treatment because of impaired spermatogenesis and/or ejaculation dysfunction can be problematic. We herein present two cases involving a 26-year-old man and a 30-year-old man with hypogonadotropic hypogonadism due to an intracranial germinoma and both wished to have children. Gonadotropin replacement therapy prior to anticancer chemotherapy resulted in subsequent spontaneous pregnancy or assisted reproductive therapy. Subsequent treatment of the tumor resulted in no recurrence for 9 and 2 years, respectively. Close consultation with an oncologist is mandatory in such cases. Depending on the tumor prognosis, however, it may be possible to delay tumor treatment and prioritize fertility because there is a possibility of impaired spermatogenesis due to additional chemotherapy.