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What embryo freezing requires before cancer treatment | CION Cancer Clinics
Embryo freezing before cancer treatment needs about two weeks of hormone injections, an egg collection, and sperm from a husband, partner or donor on the same day. The eggs are fertilised in the laboratory and the embryos are frozen. Both people must sign consent, including what happens if you separate. This page explains each requirement, the steps, and who it does not suit. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What does embryo freezing before cancer treatment require?
- What has to be in place before embryos can be frozen?
- How does embryo freezing actually work?
- Who decides what happens to frozen embryos?
- What do couples often get wrong about embryo freezing?
- Who is embryo freezing not suitable for?
- Common questions about embryo freezing before cancer treatment
The short answer
What does embryo freezing before cancer treatment require?
Embryo freezing requires about two weeks of hormone injections, an egg collection, and sperm from a husband, partner or donor on the same day. The eggs are fertilised in the laboratory, and the embryos that form are frozen before cancer treatment begins.
How it differs from egg freezing
The first half is the same: injections to ripen several eggs, then a collection under sedation with a fine needle. The difference is what happens next. Instead of freezing the eggs alone, the laboratory adds sperm and lets the fertilised eggs grow for a few days. Only those that develop well are frozen.
Why couples often choose it
Embryo freezing is a well-established method, and couples have used it in IVF for many years. For a married woman whose husband is ready to take part, it is often the option the fertility team discusses first. Because the eggs are fertilised straight away, the laboratory can also tell you how many embryos formed, which gives a clearer picture than a count of eggs alone.
Why the partner matters so much
The embryos belong to both of you. That brings legal and personal questions that egg freezing does not, and they need answers before anything is frozen. If either of you is unsure, say so early. Doubt is a reason to talk about egg freezing too, not a reason to feel guilty.
This page cannot tell you whether there is time for embryo freezing before your treatment. Your cancer team and a fertility specialist decide that together.The checklist
What has to be in place before embryos can be frozen?
- About two weeks before chemotherapy or radiation must begin
- Your oncologist's agreement that the injections are safe for your cancer
- A husband, partner or donor able to give a sperm sample on collection day
- Infection blood tests for both people
- Written consent from both people, including what happens if you separate
- A registered fertility centre that can store embryos long term
Not sure whether this applies to you?
Ask an oncologistStep by step
How does embryo freezing actually work?
Hormone injections
Daily injections under the skin help several eggs ripen at once. They can usually start at any point in your cycle. Scans every few days check progress.
Egg collection
Under sedation, a thin needle guided by ultrasound draws the eggs out. You go home the same day, usually with cramps like period pain.
Fertilisation
The same morning, sperm is added to the eggs. Where sperm numbers are low, one sperm is injected into each egg, a method called ICSI.
Growing and freezing
The embryos grow in the laboratory for a few days. Those developing well are frozen by a fast method called vitrification and stored.
Storage and later use
The embryos stay frozen until your oncologist says a pregnancy is safe. Then one is thawed and placed in the womb in a short procedure that does not need an anaesthetic.
Did you know
Not every egg collected becomes an embryo. Some eggs are not mature, some do not fertilise, and some stop growing in the laboratory. The number of embryos frozen is usually smaller than the number of eggs collected. The laboratory will tell you the count on each day, so the final number is not a surprise.
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Consent and the law
Who decides what happens to frozen embryos?
Both people decide together, and both sign. Under India's assisted reproduction law, embryos can only be created and stored at a registered clinic, with written consent from the woman and the man whose sperm is used.
The hard questions on the form
The consent form asks what should happen to the embryos if you separate, if one of you dies, or if one of you withdraws consent. These are painful questions in a week that is already hard. They are asked because, without clear answers, embryos can end up unusable by either person.
If the relationship ends
If you separate and one partner withdraws consent, the embryos usually cannot be used. That is the main reason some married women choose to freeze eggs as well as embryos, or eggs alone. Ask the centre whether splitting the eggs between the two is possible.
If donor sperm is used
Donor sperm comes through a registered bank, and the donor's identity is not shared with you. The embryos are then yours alone to decide about. Families sometimes find this choice hard to discuss, and the centre's counsellor can help you talk it through at your own pace.
Laws and centre rules change. Ask the fertility centre to explain the current rules in writing before you sign.Commonly believed
What do couples often get wrong about embryo freezing?
"We will think about the consent form after treatment."
Consent has to be signed before anything is frozen. The clinic cannot store embryos without it. Reading the form early gives you time to talk it through as a couple.
"Frozen embryos go bad after a few years."
Embryos frozen by vitrification can stay usable for many years. What usually limits storage is the consent period, the law and the yearly fee, not the embryos.
"Freezing embryos means we have to use them all."
You decide how many to use and when. Unused embryos can be kept, discarded, or in some cases given for research, according to what you both chose and the law allows.
"A frozen embryo will become a baby."
Each embryo transferred is a chance, not a promise. The woman's age when the eggs were collected matters a great deal. Many couples need more than one transfer.
Honest limits
Who is embryo freezing not suitable for?
If any of these fit, ask the team about the alternative beside it.
Women without a partner
Using donor sperm is possible but creates embryos you cannot later share with a future husband. Egg freezing keeps that choice open.
When treatment cannot wait
Some cancers, such as acute leukaemia, need treatment within days. There is no time for injections. Ovarian tissue freezing may be discussed instead.
Girls before puberty
The ovaries cannot respond to the injections yet. Ovarian tissue freezing is the option usually discussed.
When the woman is too unwell
A serious infection, very low blood counts or a bleeding risk can make injections or collection unsafe. The team will check your blood tests and tell you plainly.
When the husband's sample has no sperm
Embryos cannot be made without sperm. A urologist may be able to retrieve sperm from the testis, or the couple may consider donor sperm or freezing eggs alone for now.
Questions we are asked
Common questions about embryo freezing before cancer treatment
Is embryo freezing better than egg freezing?
Neither is right for everyone. Embryo freezing has been used for longer and the fertilisation step is already done. Egg freezing needs only one person's consent and keeps future choices open. The fertility specialist will explain which suits your situation and whether splitting the eggs between both is possible.
Does my husband need to be present on collection day?
Usually, yes, to give a fresh sample that morning. If he cannot be there, the centre may be able to freeze his sample in advance. Tell the centre early if travel or work makes the day difficult, so they can plan around it.
Can we freeze embryos if I have breast cancer?
Often, yes. For hormone-sensitive breast cancer, a tablet such as letrozole may be added so hormone levels stay lower during the injections. Your breast cancer team and the fertility specialist decide together whether this is safe and whether there is time.
Can embryos be tested for genetic conditions?
In some cases. If you carry a gene linked to your cancer, such as BRCA, the centre may discuss testing embryos before transfer. This is a specialist service and is not available everywhere. Ask the fertility centre and a genetic counsellor before collection day.
How long can embryos be stored?
Embryos can remain usable for many years. How long they may legally be stored depends on current Indian rules and the consent you both sign. Storage is charged every year, so ask the centre how renewal works and what happens if a payment is missed.
When can the embryos be used after treatment?
Your oncologist decides when a pregnancy is safe, which depends on your cancer and treatment. For some cancers a waiting period is advised. When the time comes, an embryo is thawed and placed in the womb in a short procedure similar to a smear test.
What if I cannot carry a pregnancy after treatment?
Some treatments affect the womb, not only the ovaries. If carrying a pregnancy is not safe or possible, the rules on surrogacy in India are strict and change over time. A fertility specialist can explain what is currently allowed for your situation.
Will the injections delay my cancer treatment?
The injections take about two weeks. Whether that delay is safe is decided by your oncologist, not by the fertility centre. If the answer is no, treatment comes first, and the team will talk about other ways to protect fertility.
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Sources
- National Cancer Institute — Fertility issues in girls and women with cancer
- American Cancer Society — Fertility and sexual side effects
- NHS — IVF
- Macmillan Cancer Support — Fertility and cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Egg Freezing Before Cancer TreatmentThe option that needs only your consentOvarian Tissue CryopreservationWhen there is no time for injectionsCost of Fertility Preservation in HyderabadWhat collection, laboratory work and storage costTalking to Your Oncologist About FertilityHow to ask whether there is time
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