Oncofertility: Fertility Preservation Before Cancer Treatment
Fertility preservation options before cancer treatment: egg and embryo freezing, ovarian tissue cryopreservation, and the fast-closing REI window.
A cancer diagnosis — or any treatment that threatens fertility — doesn't have to end the option of biological parenthood. Oncofertility is an entire sub-specialty built around preserving that option before treatment starts, and the window to act is usually measured in days, not weeks. Here's what's available and how urgently.
What is oncofertility?
Oncofertility is the sub-specialty that coordinates fertility preservation for people about to start treatment that could damage their reproductive system. It is not only for cancer. Autoimmune treatments (especially cyclophosphamide for lupus), bone marrow transplants, gender-affirming surgery, and some hematologic disease protocols all lead to the same conversation. If the word "chemo" or "pelvic surgery" is on the table, oncofertility is on the table.
How does cancer treatment affect fertility?
Cancer treatments threaten fertility through several distinct mechanisms. Alkylating chemotherapies damage eggs and sperm directly. Pelvic or cranial radiation reduces ovarian reserve. Surgeries involving reproductive organs physically remove tissue. The risk varies significantly by drug, total dose, and the person's age at treatment — which is why every oncofertility conversation starts with a specific regimen, not a general prognosis.
What fertility preservation options exist before starting chemotherapy?
The main options are egg freezing, embryo freezing, sperm banking, ovarian tissue cryopreservation, and GnRH agonist suppression during chemo. Egg freezing with random-start protocols is the most common path for people about to begin chemotherapy — a conventional cycle runs about two weeks from any point in the menstrual cycle, so there is no need to wait for day one. Embryo freezing has higher per-embryo success than eggs but requires sperm (partner or donor), which is a decision not everyone wants to make on a cancer diagnosis timeline. Sperm banking for male patients is fast, inexpensive, and very effective. GnRH agonist suppression (Lupron,
What is ovarian tissue cryopreservation?
Ovarian tissue cryopreservation surgically removes a piece of ovarian cortex, freezes it, and re-implants it later. It is the standard of care for prepubertal patients and is increasingly offered for adults when egg freezing is not feasible — for example, when there is no time to complete a stimulation cycle or when hormonal stimulation is contraindicated. Testicular tissue cryopreservation is the male analog and is still largely experimental.
How quickly can egg or embryo freezing be done before cancer treatment starts?
Most reproductive endocrinology practices prioritize oncofertility consults within 24 to 48 hours of referral. From there, a random-start egg or embryo freezing cycle takes about two weeks end to end — stimulation, monitoring, retrieval, and freezing. The bottleneck is usually not the procedure itself but the referral and scheduling. Preservation itself can sometimes wait a few days; the conversation with the REI cannot.
Does radiation therapy affect fertility and if so, how?
Pelvic radiation directly exposes the ovaries and uterus and can reduce ovarian reserve, scar reproductive tissue, and impair future pregnancy. Cranial radiation can affect the pituitary axis that controls reproductive hormones, which also reduces reserve. The magnitude of the effect depends on the dose, the field, and the person's age — so "does radiation affect fertility?" is almost always a specific-regimen question, not a general one, and is worth raising with the radiation oncologist before treatment starts.
What should you ask your oncologist about fertility before starting treatment?
The first question is whether the specific regimen is considered gonadotoxic, and if so, at what estimated risk. The second is whether there is time to complete a fertility preservation cycle before treatment begins — and if not, whether treatment can be safely delayed by the two weeks a random-start cycle requires. The third is a direct request for a reproductive endocrinology referral, ideally within 24 to 48 hours. If your oncologist has not mentioned fertility preservation, bring it up — this is a window that closes fast, and many people find they have to self-advocate. On coverage, many states now mandate insurance for "iatrogenic infertility" (fertility preservation required because of medical treatment), LIVESTRONG Fertility provides discounted medication through partner pharmacies, and grants exist for people who do not qualify for insurance coverage.