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Some male childhood cancer patients may have problems with their reproductive functions because of certain treatments they received. Reproductive functions include the production of sperm and male hormones and the ability of sperm to fertilize an egg.
The effect, if any, depends on the:
Treatments are available for many conditions that affect the reproductive system.
It is important to understand how the male reproductive system functions and how it may be affected by cancer treatment.
The testes (testicles) are in a loosely hanging pouch of skin known as the scrotum. When boys enter puberty, the pituitary gland in the brain releases two hormones that instruct the testes to begin producing sperm and testosterone.
When sperm fertilizes the egg of a female, she becomes pregnant.
Testosterone also regulates male functions such as:
Radiation therapy to the pelvic area, reproductive organs, and pituitary gland in the brain may affect a patient’s fertility.
Sperm-producing cells are highly sensitive to radiation therapy. Males who have radiation to the pelvic area are at risk for low sperm count.
Testosterone-producing cells are more resistant to the effects of radiation and chemotherapy unless given in high doses. But if males receive high doses of radiation, testosterone deficiency could occur.
Brain radiation can harm the pituitary gland in the brain. The pituitary gland produces 2 hormones needed for the testicles to function correctly – FSH (follicle-stimulating hormone) and LH (luteinizing hormone).
High levels of radiation to this area of the brain can lead to low levels of these hormones. FSH stimulates growth of testicles and the production of a protein that aids in sperm production. LH causes the production of testosterone.
The combination of pelvic radiation and high doses of alkylating agents causes the highest risk of damage to the ability to produce sperm.
Surgical procedures that may cause infertility or disrupt normal sexual functioning include:
The condition is also known as hypogonadism. It can delay puberty (no signs of puberty after age 14 years) or cause it to stall (no progress in puberty) in affected young boys.
After puberty, it may cause problems with:
Men may have problems with having and maintaining an erection or with ejaculation of sperm.
Infertility in men is the inability to fertilize an egg to cause a pregnancy. Infertility will be permanent for males who had both testicles removed. They will no longer be able to produce sperm. Infertility following radiation is generally permanent.
Infertility is unrelated to sexual function. In some men there are no physical signs or symptoms of infertility. Others may notice a decrease in the size or firmness of the testicles.
Males who have had one testicle removed may not have problems with fertility or testosterone deficiency. But these men should protect the remaining testicle from injury. They can wear an athletic supporter with a protective cup when participating in activities that could injure to the groin area.
It is important that boys who are at risk for reproductive health problems have a yearly check-up that includes checking of growth and the progress of puberty.
Males at risk for reproductive health problems should have blood test to check their hormone levels. These blood tests may include levels of FSH, LH, and testosterone. If the health care provider sees problems in these areas, he or she may refer the survivor to an:
If testosterone deficiency is suspected, testosterone replacement therapy may be recommended. Testosterone is available in skin patches, injections, and topical gel. An endocrinologist will determine which form of therapy is best.
Sexually mature males who are concerned about possible infertility should have a semen analysis. If sperm counts are low or not present, the test should be checked more than once. Sperm counts may recover over time. Also, sperm count can vary from day to day.
Not all insurance companies cover this procedure. Survivors should check before having the test.
Treatment options for infertility or low sperm count are available. Males who banked sperm before treatment should consult with a fertility specialist when ready to father children.
Men should not rely on low, or absent, sperm counts to prevent pregnancy, as pregnancy can occur with low sperm counts.
For more information, visit the Children’s Oncology Group’s Male Health Issues after Cancer Treatment.
Together does not endorse any branded product mentioned in this article.
Reviewed: June 2020