The esophagus, like all body tissues, is made up of individual cells. Normally, cells within the forming esophagus divide and grow very rapidly in the womb, in early childhood, and through puberty. In adulthood, new cells are formed only to replace those which have died from injury, old age or disease. The division of cells to produce new ones is under tight control by the "genes" within each cell. These genes are made up of DNA, and if it becomes damaged, the cell may start dividing out of control.Esophagus cancer starts in a single cell which has become abnormal. This cells produces millions, and eventually billions, of copies of itself. The copies are called "clones". These clones fail to function as normal esophagus tissue, but instead divert resources from healthy cells to fuel their own growth. When there are about 1 billion cells, they form a Clump, or "tumor" 1 / 2 inch across. A "tumor" Merely means a swelling, it can be caused by infection, inflammation, cancer or whatever. If a tumor only grows in it's local area (even very large) but does not have the capacity to spread to distant body areas, it is called "benign" and isnot cancer. If, however, the tumor has the ability to spread to distant body areas, it is called "malignant" andthis is cancer. The actual process of spread is called "metastasis", and can occur to any area of the body.
The most common type of benign esophageal tumor arises from the muscular layer, and is called a "leiomyoma". Unfortunately, a quickly growing tumor within the esophagus is most likely to be cancerous.
How Common is Cancer esophagus
There were12, 500 new cases of esophagus cancer and 11.000 deaths attribute -
Bale to the disease in 1996. It Accounts for 5% of Gastrointestinal cancers and about 1% of all new cancers in the USA The overall number of cases each year is steadily increasing. In some places, like Northern China, it is 10 times more common than in North America. It is the 7th most common cancer worldwide. In the U.S.A. Men are affected more than twice as commonly as women, Black men and 3 times as often as White men. The average patient is 60 years old.
What are the Types of esophagus Cancer
The most common type had always been "squamous cell carcinoma" Arising from
the upper 2 / 3 of the esophagus. Now, however, there has been a dramatic increase in another type, called "adenocarcinoma, which tends to arise in the lower 1 / 3 of the esophagus. Currently, the number of each of these two types of cancer cases is about equal, and together they make up nearly 100% of today's esophagus cancers. White men tend to get the disease more commonly in the lower esophagus, while Black men get it in the middle and upper esophagus.
There are occasional rare cancers found in the esophagus, such as "sarcomas" which arise from the muscular wall, "cylindroma" which begins from glands, and "lymphoma" that starts from the body's immune system cells within the esophagus.
The most common type of benign esophageal tumor arises from the muscular layer, and is called a "leiomyoma". Unfortunately, a quickly growing tumor within the esophagus is most likely to be cancerous.
How Common is Cancer esophagus
There were12, 500 new cases of esophagus cancer and 11.000 deaths attribute -
Bale to the disease in 1996. It Accounts for 5% of Gastrointestinal cancers and about 1% of all new cancers in the USA The overall number of cases each year is steadily increasing. In some places, like Northern China, it is 10 times more common than in North America. It is the 7th most common cancer worldwide. In the U.S.A. Men are affected more than twice as commonly as women, Black men and 3 times as often as White men. The average patient is 60 years old.
What are the Types of esophagus Cancer
The most common type had always been "squamous cell carcinoma" Arising from
the upper 2 / 3 of the esophagus. Now, however, there has been a dramatic increase in another type, called "adenocarcinoma, which tends to arise in the lower 1 / 3 of the esophagus. Currently, the number of each of these two types of cancer cases is about equal, and together they make up nearly 100% of today's esophagus cancers. White men tend to get the disease more commonly in the lower esophagus, while Black men get it in the middle and upper esophagus.
There are occasional rare cancers found in the esophagus, such as "sarcomas" which arise from the muscular wall, "cylindroma" which begins from glands, and "lymphoma" that starts from the body's immune system cells within the esophagus.
No comments:
Post a Comment