Testicular Seminoma (Pure) Stage I

Stage I testicular seminoma is the earliest and most treatable form of this cancer, with cure rates approaching 100% when caught early and managed appropriately.

Table of contents

• What is Stage I Seminoma?
• Who is Affected?
• Signs and Symptoms
• How is it Diagnosed?
• Treatment Options
• Outlook and Survival

What is Stage I Seminoma?

Stage I seminoma is the earliest stage of a type of testicular cancer called seminoma, which develops from cells that mature into sperm. At this stage, the cancer is found only in the testicle itself and has not spread to nearby lymph nodes or other parts of the body^[1][2].

Seminomas are classified as germ cell tumors, which are cancers that start in cells that normally develop into sperm. Pure seminoma means the tumor contains only seminoma cells and no other types of cancer cells. This is important because pure seminomas are treated differently than tumors that contain a mix of cell types^[3][4].

Stage I is further divided into Stage IA and IB, depending on the size of the tumor and whether it has grown into nearby structures within the testicle. Stage IS refers to cases where tumor marker levels in the blood remain elevated after surgery to remove the affected testicle^[6].

• Testicles
• Spermatic cord

Who is Affected?

While testicular cancer overall is rare, affecting about 1 in 250 males, it is the most common cancer in men between 15 and 35 years old. Seminoma specifically accounts for about 54% of all testicular cancers diagnosed in the United States^[2][3].

Classic seminoma, the most common type, usually affects people between the ages of 25 and 45. According to data from the U.S. Centers for Disease Control and Prevention, seminoma is most commonly diagnosed in men in their 30s to 60s. Between ages 30 and 44, about 64% of testicular cancer cases are seminomas^[2].

Certain factors increase the risk of developing testicular cancer. Men with an undescended testicle (a condition called cryptorchidism) have at least four times the risk compared to men with normally descended testicles. This increased risk exists regardless of whether the undescended testicle was surgically corrected. A family history of testicular cancer, particularly in a father or brother, also increases risk. Men who have had testicular cancer in one testicle are at higher risk of developing it in the other testicle^[3][4].

Signs and Symptoms

The most common symptom of seminoma is a painless lump or swelling in one testicle. Many men notice this themselves during self-examination or by accident. Other symptoms may include a feeling of heaviness in the testicles, scrotum (the sac that holds the testicles), or perineum (the area between the scrotum and anus)^[2].

Some men experience a dull ache in the testicles, perineum, or scrotum. Less commonly, there may be sudden, sharp pain in or around the testicles, or blood in the semen, a condition called hematospermia^[2].

Because Stage I seminoma is confined to the testicle and has not spread, symptoms related to cancer spreading to other parts of the body—such as lumps in the neck, cough, or shortness of breath—are not present at this stage^[2].

How is it Diagnosed?

If a doctor suspects testicular cancer based on symptoms and a physical examination, several tests are used to confirm the diagnosis and determine the stage of the cancer. Blood tests are performed to measure levels of tumor markers—substances that can be elevated when certain cancers are present. The three main tumor markers for testicular cancer are alpha-fetoprotein (AFP), beta-human chorionic gonadotropin (beta-hCG), and lactate dehydrogenase (LDH)^[4].

An important characteristic of pure seminoma is that it does not produce AFP. If a man has an elevated AFP level, even if the tumor looks like pure seminoma under the microscope, it should be treated as a mixed germ cell tumor, which requires different management^[4][5].

Imaging tests help determine whether the cancer has spread. These may include ultrasound of the testicles and CT scans (computed tomography scans) of the abdomen and pelvis to look for enlarged lymph nodes^[4].

The definitive diagnosis is made through surgery called a radical inguinal orchiectomy, which removes the affected testicle and spermatic cord (the structure that contains blood vessels and the tube that carries sperm) through a small cut in the groin. The removed tissue is then examined under a microscope by a specialist to confirm the presence of seminoma and determine its exact type^[7][10].

Treatment Options

The first step in treating Stage I seminoma is surgery to remove the affected testicle. For most men with Stage I seminoma, this surgery alone, followed by careful monitoring, is all the treatment needed. After surgery, there are three main approaches to care, and the choice depends on individual circumstances and preferences^[7][10].

Active Surveillance

Active surveillance is the preferred treatment option after surgery for Stage I seminoma because there is a low risk that the cancer will come back. Only about 15% of men with Stage I seminoma have cancer cells that have spread beyond the testicle but are too small to detect with tests. Active surveillance means having regular and frequent follow-up appointments to watch for any signs that the cancer has returned^[7][10].

During surveillance, men have regular check-ups that include physical examinations, blood tests to check tumor marker levels, and imaging tests such as CT scans. If the cancer comes back, it usually happens between 12 and 36 months after surgery. If cancer is detected during follow-up, treatment is given at that time. The advantage of surveillance is that it prevents unnecessary treatment in the majority of men whose cancer will not return^[7][10].

Radiation Therapy

Radiation therapy may be offered after surgery if a man cannot complete the regular and frequent follow-up required for active surveillance. In this approach, radiation is directed at the lymph nodes in the back of the abdomen, an area called the retroperitoneum. Sometimes radiation is also given to the lymph nodes in the pelvis. This treatment reduces the risk of cancer coming back in these areas^[7][11].

While radiation therapy is effective at preventing recurrence, it is associated with long-term side effects. These can include an increased risk of heart and blood vessel problems and a slightly increased risk of developing other cancers later in life. Because of these concerns, radiation therapy is no longer routinely recommended for all men with Stage I seminoma and is reserved for those who cannot participate in surveillance or choose not to^[5][10].

Chemotherapy

Chemotherapy may be offered after surgery for Stage I seminoma if a man cannot complete the regular follow-up required for surveillance, or if tumor marker levels remain elevated after surgery. The most common chemotherapy drug used is carboplatin, given through a needle into a vein. Typically, one or two cycles of carboplatin are given^[7][10][11].

Chemotherapy with carboplatin has been shown to be as effective as radiation therapy in preventing cancer recurrence, but with lower toxicity and fewer long-term side effects. This makes it an attractive option for men who prefer a more active treatment approach rather than surveillance^[10].

Important Considerations

Men of reproductive age should discuss sperm banking before undergoing any treatment that might affect fertility. While removing one testicle typically does not affect the ability to father children, storing sperm provides additional options for the future. If both testicles must be removed, men can still have biological children through stored sperm and assisted reproductive techniques such as in vitro fertilization (IVF)^[2][11].

Removing one testicle does not affect sexual function. Men can still have erections, orgasms, and father children naturally with one remaining testicle^[2].

Outlook and Survival

The prognosis for Stage I seminoma is excellent. With appropriate treatment, the cure rate approaches 100%. For all stages of seminoma combined, the cure rate exceeds 90%^[3][4].

According to UK statistics, almost 100% of men with testicular cancer survive for one year or more after diagnosis, and more than 95% survive for five years or more. For Stage I disease specifically, these survival rates are even higher^[20].

The high survival rates for Stage I seminoma reflect both the effectiveness of available treatments and the cancer’s responsiveness to therapy. Even if cancer recurs during surveillance, it can be successfully treated with chemotherapy or radiation therapy^[5][10].

Because of the excellent cure rates, treatment decisions increasingly focus on minimizing long-term side effects and maintaining quality of life. This is why active surveillance has become the preferred approach for many men with Stage I seminoma—it allows doctors to avoid treating men who do not need additional therapy beyond surgery, while carefully monitoring those who might need treatment later^[10].