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Testicular Cancer
Alternate Names : Cancer - Testes, Germ Cell Tumor, Seminoma
Definition
Testicular cancer is an abnormal, rapid, and invasive growth
of cancerous (malignant) cells in the testicles (male sex
glands adjacent to the penis).
Overview, Causes, & Risk Factors
Although the exact cause of testicular cancer has not been
identified, several predisposing factors seem to increase
risk.
These include a past medical history of undescended testicle(s),
abnormal testicular development, Klinefelter's syndrome
(a sex chromosome disorder that may be characterized by
low levels of male hormones, sterility, breast enlargement,
and small testes), or previous testicular cancer.
Other factors are under investigation
as possible causes, such as exposure to certain chemicals
and infection with the human immunodeficiency virus (HIV).
A family history of testicular cancer may increase risk.
There is no link between vasectomy (an operation to cause
sterility) and elevated risk of testicular cancer.
Between 6,000 and 8,000 men will be diagnosed with testicular
cancers each year. Although testicular cancer accounts for
1% of all cancers in men, it is the most common form of
cancer in young men 15 to 40 years old. It may also occur
in young boys, but only about 3% of all testicular cancer
is found in this group. White American men have about five
times the risk of African-American men and more than twice
the risk of Asian-American men. The risk for testicular
cancer has doubled among white Americans in the past 40
years but has remained the same for African-Americans. The
reasons for these differences are not known.
Testicular cancers may be classified as follows:
• Seminomas account for about 30 - 40% of all testicular
tumors. These are usually is found in men in their 30s and
40s. The condition is usually localized to the testes, although
in about 25% of cases it has spread to lymph nodes.
• Non-seminomas account for 60% of all testicular tumors;
subcategories of these tumors are listed below.
Non-seminoma tumors often contain more than one
of the following cell types:
o Embryonal carcinoma (about 20% of testicular cancers)
occurs in 20-30 year olds and is highly malignant. It grows
rapidly and spreads to the lung and liver.
o Yolk sac tumor (about 60% of all testicular cancers in
young boys).
o Teratomata (about 7% of testicular cancers in adult men
and 40% in young boys).
o Choriocarcinoma (rare).
Stromal cell tumors are a kind of tumor that is made of
Leydig cells, Sertoli cells and granulose cells. These tumors
account for only 3-4% of all testicular tumors. However,
these do make up nearly 20% of all childhood testicular
tumors. These tumors may secrete a hormone -- estradiol
-- that can cause one of the symptoms of testicular cancer,
gynecomastia (excessive development of male breast tissue).
http://health.allrefer.com/health/
testicular-cancer-info.html
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