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The Testicles

The testicles are the two oval-shaped male sex organs that sit inside the scrotum on either side of the penis.

The testicles are an important part of the male reproductive system because they produce sperm and the hormone testosterone, which plays a major role in male sexual development.

Types of testicular cancer

The different types of testicular cancer are classified by the type of cells the cancer begins in.

The most common type of testicular cancer is "germ cell testicular cancer", which accounts for around 95% of all cases. Germ cells are a type of cell that the body uses to create sperm.

There are two main subtypes of germ cell testicular cancer. They are:

  • seminomas – which have become more common in the last 20 years and now account for 50-55% of testicular cancers
  • non-seminomas – which account for most of the rest and include teratomas, embryonal carcinomas, choriocarcinomas and yolk sac tumours


Both types tend to respond well to chemotherapy.



Less common types of testicular cancer include:

  • Leydig cell tumours – which account for around 1-3% of cases
  • Sertoli cell tumours – which account for around 1% of cases
  • Lymphoma – which accounts for around 4% of cases



Read more about Hodgkin lymphoma and non-Hodgkin lymphoma.

Information sourced from the NHS website. Remember, if in doubt, visit your GP. It could save your life