Testicular Cancer

Testicular cancer is the development of a malignant mass (tumor) when the cells within the testicular tissue, located at the center of the male reproductive system, depart from their normal life cycles and begin dividing abnormally and rapidly. Anatomically located within the skin sac known as the scrotum, these organs are the centers responsible for regulating the male body’s fundamental chemistry and cellular production. Although this uncontrolled growth that begins within the internal structure of the tissue was considered highly concerning in previous years, today it is among the oncological diseases that can be completely cured at a very high rate thanks to modern urological approaches and advanced medical technologies. Recognizing this cellular change in time is the strongest key to a healthy future while preserving the body’s natural integrity.

What Is Testicular Cancer and Which Age Groups Does It Most Commonly Affect?

Men’s testicles, responsible for both the production of sperm, which are reproductive cells, and the secretion of testosterone, known as the male hormone, have a highly active and rapidly functioning cellular structure. Testicular cancer develops when the cells within this intensive production center lose their normal function due to certain genetic or environmental factors and begin multiplying uncontrollably, indefinitely, and irregularly. Over time, this uncontrolled growth forms a hard, palpable, and visible mass within the organ known as a tumor. If left untreated, cancer cells tend to spread beyond the boundaries of the organ to other parts of the body.

From a population perspective, this disease most commonly affects young men between the ages of 15 and 35. Since this age group is generally considered the peak of health and physical strength, patients often do not take the changes they notice in their bodies seriously. As a result, diagnosis may sometimes be delayed. Although it is predominantly seen in young adults, it is also known to occur, albeit rarely, in children under the age of 10 and in men over 60. Its geographical distribution worldwide is also quite remarkable. While its incidence is particularly high in Scandinavian countries and developed European nations, the rate is surprisingly low in Asian and African populations. Anatomically, statistics have shown that tumors develop in the right testicle slightly more often than in the left.

What Are the Main Risk Factors Involved in the Development of Testicular Cancer?

It is impossible to attribute the development of this disease to a single cause. At its core lies a complex interaction between genetic predispositions, hormone levels, and developmental factors. Contrary to common misconceptions in society, trauma to the testicles, sports injuries, wearing tight clothing, horseback riding, or cycling do not cause this disease. There are, however, scientifically proven and medically recognized risk factors.

The most important risk factors associated with the development of the disease are:

• Undescended testicle
• A previous tumor in the other testicle
• A history of the disease in first-degree relatives
• Klinefelter syndrome
• Down syndrome
• Congenital anomalies such as hypospadias
• Testicular shrinkage caused by mumps infection
• Advanced HIV infection

Among these risk factors, the most significant is undescended testis, medically known as cryptorchidism. During fetal development, the testicles form within the abdominal cavity and descend into the scrotum shortly before birth. Failure of this natural descent dramatically increases the risk of cancer compared with individuals without this condition. Even more interestingly, this condition not only increases the risk in the undescended testicle but also, to a certain extent, in the healthy testicle that descended normally. Genetic inheritance also plays an important role. Individuals whose father or brother has had this disease should not neglect regular medical check-ups throughout their lives.

What Are the Microscopic Types and Cellular Structures of Testicular Cancer?

The vast majority of testicular tumors originate from reproductive cells called germ cells, which are responsible for sperm production. The way these cells become cancerous directly determines how the disease will progress, how rapidly it will grow, and which treatments it will respond to most effectively. Under microscopic examination, these cancer cells are generally divided into two major categories.

The main cellular subtypes generally recognized are listed below.

• Pure seminomas
• Embryonal carcinoma
• Yolk sac tumor
• Choriocarcinoma
• Teratoma

Pure seminomas generally occur more frequently in men in their late thirties and exhibit a slower and more indolent growth pattern than other types. Their greatest characteristic is that they are extremely sensitive to radiation and drug therapies. Therefore, treatment success rates are exceptionally high, and they are usually diagnosed before spreading beyond the testicle.

In contrast, non-seminomatous tumors such as embryonal carcinoma, choriocarcinoma, and yolk sac tumors have a very different biological behavior. These tumors appear at younger ages, grow rapidly, and are known for their aggressive tendency to spread to other parts of the body. Choriocarcinoma tends to spread quickly to the lungs through the bloodstream, while yolk sac tumors are particularly prominent in early childhood. Teratomas, on the other hand, are highly unique tumors that may contain many different tissue types from the body. They are highly resistant to chemotherapy and radiation therapy, making surgery the primary treatment approach.

What Symptoms of Testicular Cancer Are First Noticed by Patients?

The first signs of cancer usually appear very quietly and painlessly. While many diseases affecting other parts of the body manifest with severe pain, this condition progresses in the opposite manner, with subtle silence. Most patients discover an unusual change in the scrotum entirely by chance while showering or during their daily dressing routine. Although this often causes anxiety and fear in young men, feelings of embarrassment unfortunately delay seeking medical attention.

The main symptoms that individuals notice in their own bodies include:

• A painless, hard lump
• Visible swelling of the scrotum
• Aching sensation in the groin and lower abdomen
• A distinct feeling of heaviness in the scrotum
• Sudden fluid accumulation

The most typical and significant symptom is a lump felt on or within the testicle, usually the size of a chickpea or hazelnut, as hard as a stone, and generally painless. This hardness may be accompanied by generalized swelling or a feeling of heaviness in the scrotum. Patients often describe this heaviness as if there were an invisible weight pulling downward. Mild aching in the lower abdomen or groin is also quite common. Severe and unbearable testicular pain is actually rare and usually occurs in unusual situations such as rapid tumor growth with bleeding into itself or impaired blood circulation. All of these symptoms require prompt professional medical evaluation.

How Is Suspected Testicular Cancer Evaluated in the Clinical Setting and Which Tests Are Performed?

When a patient presents to the hospital, the process begins with a careful and systematic medical evaluation. Any hard lump detected in the testicular region of a young patient is considered a potential malignancy until proven otherwise through detailed testing. Some patients may mistake the condition for a simple infection and lose valuable time. Therefore, advanced medical technologies are used to establish the diagnosis and eliminate uncertainty. It should be particularly emphasized that, unlike many other organs, needle biopsy performed through the scrotum is strictly avoided because it may increase the risk of spreading the disease.

The diagnostic steps performed during the evaluation are listed below.

• Detailed physical examination
• Scrotal ultrasonography
• Measurement of tumor markers in the blood
• Contrast-enhanced computed tomography
• Magnetic resonance imaging
• Advanced PET scans

The physical examination, which is the first step of the process, is essential for understanding the structure, firmness, and relationship of the mass with surrounding tissues. It is immediately followed by ultrasonography, which uses sound waves to provide crystal-clear images of the internal structure of the testicles without exposing the patient to radiation. Ultrasound can distinguish within seconds whether the mass is simply a fluid-filled cyst or a dangerous solid lesion. Certain blood markers allow physicians to detect the chemical substances secreted by cancer cells. Once the diagnosis is confirmed, comprehensive three-dimensional imaging methods such as computed tomography or MRI are used to determine whether the disease has spread to the abdomen, lymphatic system, or lungs.

How Is Testicular Cancer Staged to Determine the Extent of Disease Spread?

Once cancer has been diagnosed, the most critical step is determining the exact location of the disease within the body and the extent of its spread. This mapping process, known medically as staging, serves as the most important guide for determining the intensity and duration of treatment. During staging, physicians carefully evaluate the size of the tumor within the organ, whether it has spread to the lymph nodes located along the back wall of the abdomen, the levels of specific tumor markers in the blood, and whether distant organs have been affected.

The disease is generally classified into three main stages. Stage I is the safest stage, in which the tumor remains entirely confined within the testicle and has not yet spread to lymphatic channels or blood vessels outside the organ. Treatment success is highest at this stage, and fortunately, the majority of patients are diagnosed early. In Stage II, cancer cells have spread beyond the testicle and reached the large lymph nodes located in front of the spine along the back of the abdomen. Stage III, the most advanced stage, indicates that the cells have spread beyond the lymphatic system through the bloodstream to distant organs such as the lungs, liver, or bones. However, one of the most important facts to remember is that testicular tumors are among the rare cancers that respond exceptionally well to chemotherapy and can often be completely cured even at Stage III after spreading throughout the body.

How Is Testicular Cancer Surgery, the Main Treatment, Performed?

Surgery is the primary and indispensable treatment for this disease. Removing the cancerous tissue from the body is the first essential step for both establishing a definitive diagnosis and initiating the healing process. The surgical technique used is highly specialized and differs significantly from standard operations.

To completely prevent the spread of cancer cells during the procedure, no incision is made through the scrotum. Instead, a small incision is made in the lower groin area, similar to that used in inguinal hernia surgery. This approach is chosen because all the major blood vessels and spermatic cords supplying the testicle converge in this region. Before touching the testicle, the surgeon securely ties off these vessels and ducts from above. This vital precaution makes it virtually impossible for cancer cells to accidentally enter the bloodstream and spread throughout the body during surgery. The testicle is then removed in one piece through the inguinal canal together with all its surrounding membranes.

The thought of losing a testicle understandably causes fear and cosmetic concerns in young men. However, removal of one testicle does not lead to any deficiency in testosterone production or future fertility potential. The remaining healthy testicle quickly increases its capacity and perfectly assumes the functions of both organs. In addition, to preserve cosmetic appearance and prevent psychological trauma, silicone prostheses with natural size and weight, indistinguishable from the outside, may be inserted during the same surgical session. In very rare and carefully selected patients, organ-preserving procedures in which only the tumorous portion is microscopically removed while leaving the remainder of the testicle intact may also be successfully performed.

What Are the Protective Treatments After Testicular Cancer Surgery?

Although surgery completely removes the diseased tissue, medical science always considers the possibility that microscopic cancer cells may remain undetected. Even in Stage I disease confined entirely to the testicle, different strategies are followed based on the cell type and pathological findings to reduce the future risk of recurrence to the lowest possible level.

The treatment options offered after surgery include:

• Regular and intensive active surveillance
• Preventive single-dose chemotherapy
• Low-dose adjuvant radiotherapy

In patients managed with active surveillance, no medication or radiation is administered. However, this does not mean that treatment has ended; on the contrary, it means that the patient enters a strict follow-up program lasting for years. During this period, regular blood tests, chest X-rays, and abdominal CT scans are performed at scheduled intervals, keeping the patient’s condition under close observation. If high-risk pathological features are present, such as tumor cells invading blood vessels, a single course of reduced-dose preventive chemotherapy may be administered to reduce the likelihood of recurrence. Radiotherapy, which was frequently used in the past, is now reserved only for very limited and specific situations because of its long-term risk of causing secondary problems in organs such as the stomach or intestines.

How Is Advanced Testicular Cancer That Has Spread Throughout the Body Treated?

Once cancer cells spread beyond the testicle into the abdominal lymph nodes or even farther to the lungs, brain, or bones, the disease enters an entirely different stage. At this point, removing all cancer cells through surgery alone is no longer physically possible. Nevertheless, despite this challenging situation, testicular tumors remain one of medicine’s greatest success stories even in advanced stages.

The cornerstone of treatment at this stage consists of intensive platinum-based chemotherapy regimens that combine multiple medications. These drug combinations travel throughout the body via the bloodstream, locate cancer cells in distant regions, and destroy them from within. After several months of intensive chemotherapy, widespread tumors throughout the body often disappear completely or become inactive scar tissue. If large residual masses remain behind the abdominal cavity after chemotherapy has been completed, these areas are surgically removed using advanced robotic or open surgical techniques. As a result, complete and lasting recovery remains highly achievable even in the most advanced cases.

How Do Testicular Cancer and Its Treatments Affect Patients’ Sexual Life and Fertility?

Because this disease primarily affects very young men, treatment planning involves not only saving lives but also preserving future quality of life, fatherhood aspirations, and sexual identity. From the moment cancer is diagnosed, the stress caused by the disease itself, hormonal fluctuations, and local pressure may naturally reduce both sperm count and sperm quality. Surgery, followed by intensive chemotherapy or radiation therapy, can place significant strain on sperm-producing tissues, sometimes causing temporary and sometimes permanent impairment.

For this reason, the golden rule before initiating cancer treatment is preserving reproductive cells. Before chemotherapy or surgery begins, every patient should receive detailed counseling and be referred to a fertility center. Healthy sperm samples collected there are cryopreserved and safely stored for years until the patient wishes to have children. If natural sperm collection is not possible, healthy sperm may also be retrieved directly from the testicular tissue under microscopic guidance during surgery and preserved. Years after treatment is completed, the body’s ability to recover is remarkably high, hormone levels usually return to normal, and sexual function generally resumes completely.

Frequently Asked Questions