Embryonal Carcinoma

Overview

Embryonal carcinoma is a rare type of cancer that grows from germ cells. Germ cells are the cells in the body that normally develop into sperm or eggs. When these cells start growing out of control, the result is called a germ cell tumour, and embryonal carcinoma is one kind of germ cell tumour. It most often starts in a testicle in young men, but it can also start in an ovary in girls and women, or (more rarely) in the centre of the chest, at the back of the belly, or in the brain. Embryonal carcinoma tends to grow quickly, but it also responds very well to treatment, and most people who have it can be cured.

No, it is rare. Embryonal carcinoma is one of the less common types of germ cell tumour. Doctors see it most often in young men, usually in their late teens to late thirties. Because it is rare, you may be referred to a specialist centre that deals with these tumours regularly.

It affects young adults most of all — especially men in their twenties and thirties — because germ cell tumours of the testicle are most common at that age. It can also affect babies and young children, where it usually appears in the testicle or in the lower part of the body near the tailbone. In girls and women it can start in an ovary. It is very uncommon in older adults. Having it is not anyone's fault and nothing you did caused it.

Symptoms

Common symptoms

• A lump or swelling in one testicle, which is usually not painful
• A heavy or dragging feeling in the scrotum (the pouch of skin that holds the testicles)
• A dull ache in the lower belly, groin or back of the scrotum
• One testicle looking or feeling different from the other, or becoming firmer
• Tender or enlarged breasts, caused by hormones the tumour can make
• In girls and women: a lump or swelling in the lower belly, or belly pain
• Back pain, a cough, or shortness of breath if the cancer has spread to the lymph nodes or lungs

Symptoms in children

• A painless swelling or firm lump in the testicle or scrotum, often noticed by a parent during a nappy change or bath
• A lump in the lower back or bottom area near the tailbone
• In girls, a swelling or lump in the lower belly
• A swollen or bloated belly, poor feeding, vomiting, or constipation
• Crying or discomfort that does not settle, or a general change in how your child seems
• In babies, these tumours often respond very well to treatment, so early checking matters

Symptoms in older adults

• This cancer is very rare in older adults, so a testicle lump at this age is more likely to be something else, such as a fluid collection or another kind of growth
• Even so, any new lump, firmness or heavy feeling in a testicle should always be checked by a doctor
• A new cough, breathlessness or chest discomfort that does not settle
• Unexplained weight loss, tiredness or back pain that keeps going

Causes

Main causes

• Doctors do not know exactly why embryonal carcinoma starts. It happens when germ cells (the cells that normally make sperm or eggs) begin to grow and divide out of control, forming a tumour.
• In most cases there is no clear trigger and nothing the person did to cause it.
• In some people it is linked to an abnormal change in a gene or chromosome inside the tumour cells themselves — this is not something you inherit in most cases.

Risk factors

• Being a young adult man — germ cell tumours of the testicle are most common between the late teens and late thirties
• Having an undescended testicle as a baby (a testicle that did not drop into the scrotum), especially if it was not corrected early
• Having had a germ cell tumour before, or having a family member who has had one
• Being born with certain rare conditions that affect how the sex organs develop
• Having a rare pattern of gene changes (for example Klinefelter syndrome, where a boy is born with an extra X chromosome)
• Having fertility problems — some studies suggest a link, but this is not fully understood

When to see a doctor

See a doctor urgently if:

• You or your child has a new lump or swelling in a testicle or scrotum — get it checked within days, not months
• There is a lump or swelling in the lower belly, especially in a child
• You have ongoing back pain, belly pain, a cough or breathlessness that does not settle
• You notice breast tenderness or swelling in a young man
• You have sudden, severe testicle pain — this is an emergency, call your local emergency number or go to the nearest emergency department

Book a routine appointment if:

• You are simply unsure and want reassurance about how your testicles or your child's look and feel
• You have a testicle that has changed shape or feels firmer than the other one
• You have questions about fertility, or a family history of germ cell tumours
• You want to learn how to do a testicular self-check properly

Diagnosis

A doctor will start by asking about your symptoms and gently feeling the scrotum, testicles and belly. If anything seems unusual, you will usually be referred quickly to a specialist team. Tests can show whether the lump is a germ cell tumour, what type it is, and whether it has spread. In many cases the first step in treatment is an operation to remove the affected testicle, and the tumour is then examined under a microscope to confirm the exact type.

Tests that may be done

• Physical examination of the testicles, scrotum and belly
• An ultrasound scan — a painless scan using sound waves that shows what a lump looks like inside
• Blood tests to measure tumour markers — proteins that some germ cell tumours release into the blood (for example AFP, hCG and LDH)
• Surgery to remove the affected testicle (called an orchidectomy) so the tissue can be examined under a microscope — this confirms the diagnosis and is also the first part of treatment
• A CT scan of the chest, belly and pelvis to check whether the cancer has spread
• Sometimes an MRI scan, especially if the tumour is in the brain
• Fertility tests, such as a sperm count, before treatment begins if you may want children later

What to expect at your appointment

You will usually be seen by a specialist within a couple of weeks of being referred. Some tests happen the same day and others over a few days. Waiting for results is often the hardest part, so it can help to bring someone with you and to write down your questions. Your team will explain each step before it happens. If you are asked to give a sperm sample for storage, this is done before chemotherapy starts, so mention your wishes about children early.

Treatment

Embryonal carcinoma is treated by a specialist team, usually in a cancer centre that deals with germ cell tumours. Treatment depends on where the tumour is, its size, whether it has spread, and your age and general health. The main treatments are surgery to remove the tumour, chemotherapy (strong medicine that kills cancer cells), and sometimes more surgery to remove lymph nodes or areas the cancer has reached. Because these tumours grow fast, they also tend to respond quickly to chemotherapy, and most people are cured.

Self-care at home

• Keep a simple diary of appointments, test results and questions so you feel more in control
• Ask for written information and take notes — it is hard to remember everything at appointments
• Rest when your body asks for it, especially during chemotherapy
• Tell your team about any new symptom early rather than waiting for your next appointment
• Ask about keeping active gently and about what to avoid during treatment
• Avoid people with infections while your immune system is low, and wash your hands often
• Check your remaining testicle now and then so you know what is normal for you

Medical treatments

Surgery to remove the affected testicle is usually the first step, and it both confirms the diagnosis and removes the main tumour. After that, chemotherapy is very often used. This is medicine given into a vein (through a drip) that travels around the body killing cancer cells. It is given in cycles over several weeks. Some people need chemotherapy before surgery, and some need it afterwards to lower the chance of the cancer coming back. Radiotherapy (high-energy X-rays) is used much less often for this particular type of tumour, but your team will explain whether it is right for you. Extra surgery may be needed to remove lymph nodes in the back of the belly or any areas where the cancer has spread. Your team will also talk with you about preserving fertility and about storing sperm before chemotherapy if that is relevant. Because treatment affects everyone differently, your specialist will explain the exact plan for you.

When is surgery considered?

Surgery is usually the first treatment. The affected testicle is removed through a small cut in the groin, and most people go home the same day or the next day. If you are worried about how you will look or feel afterwards, ask about a testicle implant, which can be put in at the same time or later. Further surgery to remove lymph nodes or other affected areas may be recommended after chemotherapy, depending on what the scans show.

Living with this condition

Life during treatment is a mix of hospital visits, rest and working out a new routine. Many people keep working in some way, at least between cycles, and others need to step back for a while. Tiredness is common, so plan your days around what matters most and let people help. Practical things like lifts to appointments, help with childcare or someone to sit with you during treatment can make a real difference. After treatment ends, follow-up appointments will check that all is well and help you get back to normal life.

Lifestyle tips

• Keep gently active — short walks, stretching and light housework all help with tiredness and mood
• Eat regularly and keep meals simple; small snacks often work better than large meals during treatment
• Avoid smoking and keep alcohol low, especially during treatment
• Protect your skin from strong sun, as some treatments make skin more sensitive
• Keep up with vaccinations and health checks your team recommends
• Check your remaining testicle regularly so you notice any change early

Diet and exercise

There is no special diet that treats embryonal carcinoma, but eating well helps you cope with treatment. Aim for regular meals with a mix of vegetables and fruit, starchy foods, and protein such as beans, eggs, fish or meat. If your appetite is poor, small snacks every couple of hours can help. Drink enough fluids, especially during chemotherapy. Gentle exercise — a daily walk, light gardening, or short bike rides — helps with tiredness, keeps your muscles working and lifts mood. Build up slowly and stop if you feel unwell. Ask your team before starting anything strenuous.

Mental health and emotional wellbeing

Being told you have cancer, and going through treatment, can bring shock, fear, anger and sadness. Many people also feel worried about body image, fertility and whether the cancer will come back. These feelings are normal and they usually change over time. Talking helps — with a partner, a friend, your GP, or a counsellor. Ask your cancer team about psychological support; it is a normal part of cancer care. If you feel low, anxious, hopeless, or have thoughts of harming yourself, please reach out straight away: contact your local emergency number or a crisis line in your country, or speak to your doctor the same day. You do not have to cope alone.

Prevention

There is no sure way to prevent embryonal carcinoma, and nothing you did caused it. What you can do is get to know what is normal for your body so you notice changes early. For men and boys, that means knowing how your testicles normally look and feel, and checking now and then after a warm bath or shower. For parents, it means noticing any swelling in your child's scrotum or belly. If something changes, get it checked — early treatment gives the best results.

Vaccines

There is no vaccine that prevents embryonal carcinoma.

Screening programmes

There is no national screening programme for germ cell tumours such as embryonal carcinoma, because the condition is rare and self-checking has not been shown to be reliable enough as a screening test. Instead, doctors rely on people noticing changes and getting them checked, and on prompt referral when a lump is found. If you have a strong family history or a previous germ cell tumour, ask your doctor whether you need extra follow-up.

Complications

If left untreated

• The cancer can spread (metastasise) through the blood and lymph channels, most often to the lymph nodes at the back of the belly, the lungs, the liver, or rarely the brain
• A large tumour can press on nearby structures, causing pain, swelling or breathing problems
• Hormones made by the tumour can cause breast tenderness or swelling in men
• Fertility can be affected, both by the cancer and by some treatments
• In rare cases, a tumour can press on large veins in the chest, causing swelling of the face and arms and difficulty breathing — this is an emergency

Long-term outlook

The outlook for embryonal carcinoma is generally very good. These tumours grow fast, but they also respond strongly to chemotherapy, and most people — including many with cancer that has spread — are cured. Cure rates are highest when the tumour is found early and treated at a specialist centre. Treatment can affect fertility, so talk to your team about storing sperm before you start if having children matters to you. Regular follow-up after treatment helps catch any problems early. If you have been diagnosed, ask your specialist to explain what the expected outcome is for your particular situation — general numbers cannot tell your whole story.

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