What causes testicular cancer

What is Testicular Cancer?

Testicular cancer is a disease in which malignant (cancerous) cells form in the tissues of one or both testicles. The testicles are two oval-shaped glands located in the scrotum, a loose pouch of skin hanging below the penis. They produce sperm and male hormones, primarily testosterone. While it is one of the most common cancers in young men, it is also one of the most treatable.

What Causes Testicular Cancer?

The precise reason why testicular cancer develops is not fully understood. However, medical experts have identified several factors that can increase a man's risk of developing the disease. These are known as risk factors. It's important to note that having one or more risk factors does not mean a person will definitely get cancer, and many men who develop testicular cancer have no known risk factors.

Key Risk Factors Explained

1. Undescended Testicles (Cryptorchidism)

This is one of the most significant risk factors. Cryptorchidism is a condition where one or both testicles fail to descend from the abdomen into the scrotum during fetal development. Men who have had an undescended testicle, even if it was surgically corrected (orchiopexy), have a higher risk of developing testicular cancer compared to men whose testicles descended normally. The risk is higher if the testicle remained undescended for a longer period or if it was located higher in the abdomen.

2. Family History

Having a close relative (father, brother, or son) who has had testicular cancer increases a man's risk. If more than one close relative has had the disease, the risk is even greater. This suggests a possible genetic component, although specific genes have not been definitively identified for most cases.

3. Age

Testicular cancer most commonly affects men between the ages of 15 and 35. However, it can occur at any age, and a smaller peak in incidence is sometimes seen in men over 50.

4. Race and Ethnicity

Testicular cancer is more common in white men than in men of other racial or ethnic groups. The reasons for this difference are not fully understood but may involve genetic or environmental factors.

5. Previous Testicular Cancer

Men who have had testicular cancer in one testicle have a significantly higher risk of developing cancer in the other testicle.

6. Certain Genetic Conditions

Some inherited genetic conditions are associated with an increased risk of testicular cancer. These include:

• Klinefelter syndrome: A genetic condition in which a male is born with an extra X chromosome (XXY). Men with Klinefelter syndrome often have smaller testicles and may experience infertility.
• Other rare genetic syndromes: Such as Down syndrome and certain disorders affecting reproductive organ development.

7. HIV Infection

Men who are infected with the Human Immunodeficiency Virus (HIV) may have a slightly increased risk of developing testicular cancer, particularly a type called non-seminoma germ cell tumors.

How Does Cancer Start?

Cancer generally begins when cells in the body develop errors, or mutations, in their DNA. The DNA inside a cell contains the instructions that tell the cell how to grow, divide, and function. DNA mutations can cause these instructions to become faulty, leading cells to grow and divide uncontrollably, forming a mass of cells called a tumor. These cancerous cells can invade nearby tissues and spread to other parts of the body (metastasize).

In the case of testicular cancer, these abnormal changes typically occur in the germ cells within the testicles. Germ cells are the cells that produce sperm. Most testicular cancers develop from these germ cells and are called germ cell tumors (GCTs). GCTs can be further divided into two main types: seminomas and non-seminomas. Both types can spread, but they often respond differently to treatment.

What is NOT a Cause?

It's important to dispel common myths. Wearing tight underwear, riding bicycles, or having a previous testicular infection or inflammation (like orchitis) have not been proven to cause testicular cancer. While these factors might cause pain or discomfort in the testicles, they do not lead to the development of cancer.

Early Detection is Key

Although the exact causes are often unknown, understanding the risk factors and being aware of any changes in the testicles is crucial. Regular self-examinations and prompt medical attention for any lumps, swelling, or pain can lead to early diagnosis and highly successful treatment outcomes for testicular cancer.