How do chemotherapy and radiation therapy affect male fertility and sperm production?

Chemotherapy and radiation therapy can have profound and often long-lasting effects on male fertility by disrupting spermatogenesis. According to Meistrich (2013), these cancer treatments target rapidly dividing cells, which includes the germ cells in the testes responsible for producing sperm. As a result, men undergoing chemotherapy or radiotherapy often experience a temporary or permanent reduction in sperm production, depending on the type, dose, and duration of treatment.

Radiation therapy can directly damage the DNA of spermatogenic cells and induce apoptosis, leading to decreased sperm count (oligospermia) or complete absence of sperm (azoospermia). Similarly, chemotherapy agents, particularly alkylating drugs, are highly toxic to spermatogonial stem cells, which are crucial for the ongoing production of sperm. Damage to these stem cells can lead to long-term or permanent infertility. The severity of the impact varies: lower doses may allow gradual recovery of sperm production over months to years, whereas high doses often result in irreversible infertility (Meistrich, 2013).

In addition to reducing sperm quantity, chemotherapy and radiotherapy can impair sperm quality, including motility and morphology, and increase the risk of DNA damage. This can compromise the ability of sperm to fertilize an egg or may increase the risk of genetic abnormalities in offspring. For this reason, fertility preservation strategies, such as sperm cryopreservation prior to treatment, are strongly recommended for men of reproductive age who will undergo gonadotoxic therapies (Meistrich, 2013).

Meistrich, M. L. (2013). Effects of chemotherapy and radiotherapy on spermatogenesis in humans. Fertility and Sterility, 100(5), 1180–1186. https://doi.org/10.1016/j.fertnstert.2013.08.010

What fertility preservation options are available for men before cancer treatment begins?

Fertility preservation is an important consideration for men diagnosed with cancer because many cancer treatments, including chemotherapy, radiotherapy, and surgery, can negatively affect spermatogenesis and lead to temporary or permanent infertility. According to Li et al. (2024), the most established and effective fertility preservation method for adult male cancer patients before treatment begins is sperm cryopreservation, also known as sperm banking. The authors describe sperm cryopreservation as the current standard of care and recommend that semen samples be collected before the initiation of gonadotoxic treatment whenever possible (Li et al., 2024).

Sperm cryopreservation involves collecting semen samples and freezing them for future reproductive use. These stored sperm samples can later be used in assisted reproductive technologies (ART), including intrauterine insemination (IUI), in vitro fertilisation (IVF), and intracytoplasmic sperm injection (ICSI). In their systematic review and meta-analysis of 69 studies involving over 32,000 male cancer patients, Li et al. (2024) found that cryopreserved sperm could successfully result in pregnancies and live births following ART treatment. Among the ART methods examined, ICSI demonstrated the highest pooled clinical pregnancy and delivery rates compared with IVF and IUI.

The review further highlighted that fertility counselling should occur as early as possible after a cancer diagnosis to maximise opportunities for sperm preservation prior to treatment. Early referral is important because cancer therapies may rapidly impair sperm quality and quantity. Although sperm cryopreservation is widely accepted and clinically available, the authors noted that utilisation rates remain relatively low among some patient populations due to limited awareness, emotional distress at diagnosis, financial barriers, and lack of timely referral from healthcare providers (Li et al., 2024).

Li et al. (2024) also discussed experimental fertility preservation techniques, including testicular tissue cryopreservation and spermatogonial stem cell preservation. However, these methods are still considered investigational and are not yet established clinical options for adult male patients. Consequently, sperm cryopreservation remains the primary recommended strategy for preserving fertility in men before cancer treatment begins.

Within the NHS, men diagnosed with cancer are usually referred urgently to a fertility clinic before starting chemotherapy, radiotherapy, or surgery because these treatments can damage sperm production and affect future fertility. During the first appointment, a specialist discusses the risks to fertility and explains available preservation options based on the patient’s treatment plan and personal circumstances.

The main fertility preservation method offered is sperm cryopreservation (sperm banking). This involves collecting and freezing sperm samples before cancer treatment begins so they can be used later in assisted reproductive treatments such as IVF or ICSI. Before samples can be stored, patients are tested for HIV and hepatitis B and C, and the sperm is analysed to assess quality. Samples are usually produced through masturbation at the fertility clinic, although additional procedures such as surgical sperm retrieval may be offered if necessary.

Within the NHS, sperm storage for medical reasons can legally continue for up to 55 years, provided consent forms are completed and regularly reviewed under the Human Fertilisation and Embryology Act. Funding for sperm freezing and storage is often available through the NHS for eligible cancer patients, and counselling services are also offered to provide emotional support during diagnosis and treatment.

Li Q, Lan QY, Zhu WB, Fan LQ, Huang C. Fertility preservation in adult male patients with cancer: a systematic review and meta-analysis. Hum Reprod Open. 2024;2024(1):hoae006. doi:10.1093/hropen/hoae006.

Can male fertility recover naturally after cancer treatment, and what factors influence recovery?

Male fertility can recover naturally after cancer treatment; however, the extent and likelihood of recovery vary considerably depending on the type of treatment received and individual patient factors. According to Duffin et al. (2024), cancer therapies such as chemotherapy and radiotherapy can damage the testes by impairing spermatogonial stem cells, which are essential for continuous sperm production. In some patients, enough of these stem cells survive treatment to allow spermatogenesis to gradually resume over time, whereas in others the damage may be severe enough to result in long-term or permanent infertility.

The type and intensity of cancer treatment are among the most important factors influencing fertility recovery. Alkylating chemotherapeutic agents are particularly harmful to germ cells and are strongly associated with prolonged or irreversible impairment of sperm production. Likewise, radiotherapy involving the testes or surrounding pelvic region can significantly reduce fertility, especially when higher radiation doses are administered. Combined treatment regimens involving both chemotherapy and radiotherapy generally carry a greater risk of gonadal damage than single-treatment approaches.

The paper also highlights that recovery of fertility is influenced by patient-specific characteristics. These include the individual’s age at the time of treatment, pre-treatment fertility status, overall health, and the type of cancer being treated. In addition, the duration of time since treatment is important, as spermatogenesis may recover slowly and can take several years to return. While some men regain normal sperm counts within a few years, others may remain azoospermic permanently if spermatogonial stem cells are irreversibly damaged.

Furthermore, Duffin et al. (2024) note that the long-term reproductive effects of newer targeted cancer therapies are still being investigated. Although these therapies may be less toxic than traditional chemotherapy, their impact on male fertility remains uncertain. Consequently, the authors emphasise the importance of fertility preservation strategies, such as sperm banking, prior to the initiation of cancer treatment because natural recovery cannot be guaranteed.

Kathleen Duffin, Rod T. Mitchell, Mark F.H. Brougham, Geert Hamer, Ans M.M. van Pelt, Callista L. Mulder, Impacts of cancer therapy on male fertility: Past and present, Molecular Aspects of Medicine, Volume 100, 2024, 101308, ISSN 0098-2997, https://doi.org/10.1016/j.mam.2024.101308.

What emotional and psychological challenges do men face when dealing with infertility after medical treatment?

The emotional and psychological impact of infertility following medical treatment can be significant. Patients may suddenly be faced with complex, long-term decisions that affect their future family planning, often at a time when they may not feel fully prepared to make them.

For example, procedures such as testicular sperm extraction (TESE) or the need to produce multiple samples for sperm banking can be highly stressful, particularly in the context of an already challenging medical diagnosis. In some cases, it may not be possible to retrieve or preserve sperm at all, which can add further emotional distress and feelings of loss.

In addition, certain medical treatments, including some chemotherapy regimens, may carry a risk of temporary or permanent infertility. Even when fertility is potentially reversible, uncertainty around future reproductive ability can lead to anxiety and emotional strain, particularly for patients who are focused on recovery and rebuilding their lives after treatment.

For children and adolescents undergoing cancer treatment, fertility preservation techniques such as testicular tissue cryopreservation are increasingly available, alongside established approaches like sperm banking where appropriate. However, the psychological impact in this group can be particularly complex, as younger patients may not fully understand fertility implications at the time of diagnosis and treatment. As a result, discussions around fertility preservation can be emotionally challenging for both patients and their families.

Overall, infertility following medical treatment can have profound psychological effects, including anxiety, uncertainty, grief, and concerns about future identity and life plans, highlighting the importance of sensitive counselling and psychological support throughout the fertility preservation process.

To discuss your fertility please do get in touch.