The short answer
Most fertility preservation only works before treatment starts, so the door closes early. Freezing eggs or embryos needs 2 to 3 weeks of hormone stimulation, while ovarian tissue freezing and sperm banking do not. Ask your oncologist whether a short delay is safe for your cancer.
Most fertility preservation options only work before treatment starts, so this decision has a closing door on it.
Egg and embryo freezing need 2 to 3 weeks of hormone stimulation, which is the main scheduling problem.
Ovarian tissue freezing needs no hormone stimulation, so it suits people who cannot delay treatment.
Ovarian transposition moves the ovaries out of the radiation field and succeeds about half the time.
Choose how you want to understand this
The full explanation.
Fertility Preservation Before Cancer Treatment
Fertility preservation is one of the few cancer decisions with a closing door on it. Most of these options only work if they are done before treatment starts. The chemotherapy or radiation that treats the cancer can also damage the eggs or the sperm. It can damage the glands that control them too.
The National Cancer Institute puts the timing plainly. Having a biological child one day may matter to you. If so, talk with your doctor and a fertility specialist before cancer treatment starts. Your care team decides whether a short delay is safe for your cancer. Some cancers can wait a few weeks. Some cannot.
Which treatments raise the risk
NCI says fertility changes can be temporary or permanent. It depends on the treatment type, the dose, and how long it lasts. It also depends on your age, your fertility before diagnosis, and where the cancer is.
- Chemotherapy is the group most likely to harm egg-producing and sperm-producing cells. The alkylating agents carry the highest risk. Higher doses and several drugs together raise it further.
- Radiation therapy can damage the ovaries or testicles. The risk comes from radiation to the pelvis, to the reproductive organs, or to the central nervous system. Proton beam and intensity-modulated radiation may do less harm than standard radiation.
- Surgery that removes reproductive organs causes permanent infertility. Surgery on the belly or pelvis can leave scar tissue.
- Stem cell transplant starts with high-dose chemotherapy or radiation. That can damage ovaries or sperm-forming cells.
- Hormone therapy can lower sperm counts or stop ovarian function.
- Targeted therapy and immunotherapy are still being studied. Some tyrosine kinase inhibitors may lower fertility. The evidence here is genuinely thin, and NCI says so.
Options if you have ovaries
Egg freezing and embryo freezing both start with hormone injections. The injections stimulate the ovaries. A procedure then collects mature eggs. Eggs can be frozen on their own. Or they can be fertilized with sperm in a lab and frozen as embryos. The American Cancer Society says the stimulation step "can take 2-3 weeks for this to work." That two-to-three-week window is the main scheduling problem. You and your oncologist have to solve it.
Ovarian tissue freezing removes egg-containing tissue by surgery, through a laparoscope. The tissue is thawed and put back later. It does not need hormone stimulation. So it suits people who cannot delay treatment. It also suits people who cannot take hormonal medicines, or who have not gone through puberty.
Ovarian transposition is surgery. It moves the ovaries away from the radiation field. ACS says it is "usually best to do the procedure just before you start radiation therapy." ACS also says it is "successful about half of the time."
Ovarian shielding puts lead shields over the ovaries during radiation. Radical trachelectomy removes the cervix but keeps the uterus. It is used for some early-stage cervical cancers. GnRH agonists shut down ovarian function during treatment.
Options if you have testicles
Sperm banking is the most common approach after puberty. Samples are collected, tested for count and movement, then frozen. Collection is usually by masturbation. Other methods can be used when that is not possible. They include penile vibratory stimulation, electroejaculation, and collection from urine.
TESE and TESA take sperm straight from testicular tissue, with surgery or a needle. They are for people who cannot produce a semen sample or who have a blockage. Testicular tissue freezing for boys before puberty is still experimental. Clinical trials are ongoing. Testicular shielding protects the testicles from scatter radiation.
Sperm banking is fast compared with egg retrieval. That matters if treatment starts within days. ACS notes a limit, though. Some people with fast-growing cancers such as acute leukemia may be too ill to produce samples at all.
What it costs
ACS gives these figures. Freezing eggs or embryos costs "$10,000 or more, not including storage fees." Sperm banking runs "about $500-$1000," with storage "about $200-$500 per year." Some insurance plans cover part of it. States differ in whether they require coverage. NCI points to the Oncofertility Consortium, the Alliance for Fertility Preservation, and Livestrong Fertility. Those groups offer information, state coverage rules, and financial help. Ask whether your hospital has a patient navigator.
One more thing before treatment
Fertility can drop without disappearing. NCI notes there may still be a chance of pregnancy during treatment. Some cancer treatments can be harmful or cause a miscarriage. So your doctor may recommend birth control or condoms while you are being treated.
If you decide not to preserve fertility, that is a legitimate choice. NCI notes one thing. Survivors were less regretful if they had met with a fertility specialist. That held true whichever way they decided.
Sources
- National Cancer Institute: Fertility Issues in Girls and Women with Cancer. https://www.cancer.gov/about-cancer/treatment/side-effects/fertility-women
- National Cancer Institute: Fertility Issues in Boys and Men with Cancer. https://www.cancer.gov/about-cancer/treatment/side-effects/fertility-men
- American Cancer Society: Preserving Your Fertility When You Have Cancer. https://www.cancer.org/cancer/side-effects/fertility/preserving-fertility-in-women.html
Words to know
Tap any term to see what it means.
Common questions
Why does this have to be decided before treatment starts?
Because the chemotherapy or radiation that treats the cancer can also damage eggs, sperm, and the glands that control them. NCI advises talking with your doctor and a fertility specialist before treatment begins if having a biological child one day may matter to you. Your care team decides whether a short delay is safe for your cancer: some can wait a few weeks, some cannot.
How long does egg or embryo freezing hold up treatment?
Both start with hormone injections to stimulate the ovaries, and ACS says that step can take 2 to 3 weeks to work. Eggs are then collected and frozen on their own, or fertilized in a lab and frozen as embryos. That two-to-three-week window is the main scheduling problem you and your oncologist have to solve.
What are my options if I cannot delay treatment at all?
Ovarian tissue freezing removes egg-containing tissue through a laparoscope and needs no hormone stimulation, so it suits people who cannot wait, cannot take hormonal medicines, or have not gone through puberty. Ovarian transposition moves the ovaries out of the radiation field and is usually best done just before radiation starts; ACS says it is successful about half of the time. Sperm banking is fast compared with egg retrieval.
What does it cost, and is there help paying?
ACS puts freezing eggs or embryos at $10,000 or more, not counting storage fees. Sperm banking runs about $500 to $1,000, with storage about $200 to $500 a year. Some insurance plans cover part of it and states differ on whether coverage is required. NCI points to the Oncofertility Consortium, the Alliance for Fertility Preservation, and Livestrong Fertility for coverage rules and financial help.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Speak With Trained Specialists & Human Navigators
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Immediate emergency guidance for fever (>100.4°F during chemo), severe pain, or shortness of breath.
Help Us Improve This Guide
Did this explanation answer your question and help you determine your next step?
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Written by: Cancer ExplainedSources last checked: 2026-07-28 what this meansLast updated: 2026-08-16Next planned review: 2027-01-28
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.
Related articles
Still have questions?
Educational answers, plain language
Free to print and share