Should survivors of childhood cancer or testicular cancer be screened for androgen deficiency?

Epidemiology of Male Hypogonadism

The epidemiology of male hypogonadism has been understudied. Of the known causes of endogenous androgen deficiency, only Klinefelter syndrome is common with a likely population prevalence of greater than 5:10,000 men (possibly as high as 10-25:10,000). Mild traumatic injury might also be a common cause of androgen deficiency (prevalence 5-10:10,000 men), but large, long-term studies must be completed to confirm this prevalence estimation that might be too high. The classic causes of male androgen deficiency-hyperprolactinemia, pituitary macroadenoma, endogenous Cushing syndrome, and iron overload syndrome-are rare (prevalence < 10,000 men).

Testicular tumors in children and adolescents: long-term endocrine and fertility issues

The treatment modalities for testicular tumors (surgery, chemotherapy, and radiotherapy), have different associated gonadotoxic risks and the overall survival for most pediatric patients with testicular tumors is very good. However, necessary treatments may lead to the development of lasting gonadal dysfunction and subsequent negative health and quality of life impact. Research with long-term follow-up for patients who have undergone surgery as the sole treatment modality for testicular tumors in childhood are lacking. It is currently unclear if surgery leads to long-term negative functional outcomes. Alkylating agents (e.g., cyclophosphamide) have long been known to increase risk of infertility; platinum-based therapies used frequently for patients with germ-cell tumors (GCTs) also seem to carry some risk of gonadotoxicity, although they have not been as well studied. Radiotherapy to the gonads is toxic and Leydig cells are particularly sensitive to high doses of radiation (>12 Gy). Long-term fertility and hormonal impact vary based on the patient’s age, as well as the type and intensity of the oncological treatment prescribed. Counselling regarding fertility risk and preservation options should ideally take place before initiating potentially gonadotoxic treatments. Hypogonadism in peri-pubertal boys can present as delayed onset or failure to progress through puberty. Sperm cryopreservation should be offered for post-pubertal boys who are able to provide a semen sample. For prepubertal boys or young males who cannot provide a semen sample, only experimental options are currently available. Much of the data reviewed here is extrapolated from research done on adult males whose reproductive and hormonal outcomes may not be comparable to younger patients who do not yet have fully developed reproductive systems. Currently, a lack of good quality evidence in this age range causes this restriction to be unavoidable. Patients and their families want to be informed of the risks and treatment options for preserving testicular function. As research continues in this field, it grows more important for urologists to be aware of the outcomes and options for their patients.