How Do Blood Cancers and Their Treatment Affect Fertility, and What Can Be Done Before Treatment?

Overview: As treatment for hematologic malignancies improves, more patients achieve long-term survival, making post-treatment quality of life increasingly important. Fertility preservation is one issue young patients should consider before treatment.

For most people with blood cancers, reduced fertility is more often caused by chemotherapy, radiotherapy or hematopoietic stem cell transplantation than directly by the cancer itself. Learning about these risks and possible protective measures before treatment can support better future planning.

Do blood cancers affect fertility?

After diagnosis, many patients worry that having a blood cancer automatically means they will be unable to have children.

For most patients, reduced fertility is more closely related to treatment than to the disease itself.

There are exceptions. For example, some men with Hodgkin lymphoma may have markedly reduced sperm counts even before treatment. Different blood cancers therefore do not have identical effects on fertility.

What factors affect fertility in patients with cancer?

Cancer-related infertility may be temporary or permanent.

Future fertility can be influenced by the disease, the type of treatment and its side effects, other medical conditions, the local availability of fertility-preservation services and whether assisted reproductive technologies are used. Each patient's situation is different and requires an individualized medical assessment.

Why can chemotherapy affect fertility?

Chemotherapy is an important potential cause of impaired fertility.

Some chemotherapy drugs damage reproductive cells. In men, they may reduce sperm counts or temporarily stop sperm production. In women, they may damage ovarian follicles and interfere with normal ovulation.

Alkylating agents, including cyclophosphamide, ifosfamide and melphalan, are associated with relatively greater reproductive risks. High-dose chemotherapy and combination regimens generally cause more reproductive damage than a single drug. In some patients, the effects may be long-lasting or permanent.

How can radiotherapy affect reproductive function?

Radiotherapy can affect fertility in both men and women.

In men, it may reduce sperm counts and testosterone levels. In women, it may damage eggs, impair ovarian function and hormone secretion, and in severe cases lead to diminished ovarian function or premature ovarian insufficiency.

Risks are generally higher with pelvic irradiation or total-body irradiation given before HSCT. In addition, women who become pregnant after certain treatments may face increased risks of miscarriage, preterm birth or low birth weight.

Modern radiotherapy seeks to limit side effects through precise targeting and carefully divided doses, but reproductive damage cannot always be completely prevented.

Why does HSCT pose a particular fertility risk?

Patients usually receive intensive conditioning therapy before HSCT. This is a major reason fertility may be affected.

In women, transplant-related treatment may cause premature ovarian insufficiency, menstrual abnormalities, reduced sexual desire and problems associated with chronic graft-versus-host disease (cGVHD), all of which may affect reproductive health.

Patients who hope to have children are therefore generally advised to complete a fertility assessment before transplantation and consider suitable protective measures to reduce potential effects on reproductive health.

What can be done to protect fertility before treatment?

If a treatment regimen is likely to affect future fertility, patients should consult their treating doctor and a reproductive-medicine specialist as early as possible.

Depending on their circumstances, men may consider sperm freezing, sperm retrieval or testicular-tissue preservation. Women may consider egg freezing, embryo freezing, ovarian-tissue cryopreservation or ovarian transposition. The appropriate choice depends on the disease and treatment timetable.

Will every patient lose fertility?

No. The degree of reproductive impairment varies substantially across diseases, treatments and individuals.

Some patients gradually recover reproductive function after treatment, while others experience long-term effects. Assessing risk and taking appropriate action before treatment is therefore often more useful than waiting until treatment has ended.

Summary

In patients with hematologic malignancies, treatment often has a greater effect on fertility than the cancer itself. Chemotherapy, radiotherapy and HSCT can impair male and female reproductive function, with particularly significant risks from intensive chemotherapy and transplant conditioning.

For young patients hoping to have children, assessment and appropriate fertility-protection measures before treatment may help preserve future reproductive options.