Esophageal Cancer: Introduction

Esophageal Cancer: Introduction

What is cancer?

Cancer is when cells in the body change and grow out of control. Your body is made up
of tiny building blocks called cells. Normal cells grow when your body needs them, and
die when your body doesn’t need them any longer.

Cancer is made up of abnormal cells that grow even though your body doesn’t need them. In most cancers, the abnormal cells grow to form a lump or mass called a tumor. If cancer cells are in the body long enough, they can grow into (invade) nearby areas. They can even spread to other parts of the body (metastasis).

What is esophageal cancer?

Esophageal cancer is cancer that starts in your esophagus.

Understanding the esophagus

The
esophagus is a tube that makes up part of the digestive tract. It carries the food and
liquid you eat from your throat to your stomach. In adults, it’s about 10 inches
long. The esophagus is located behind the windpipe (trachea) and in front of your
spine.

When
you swallow, the esophagus tightens and relaxes. This causes “waves” along the tube.
This motion moves food down into your stomach. Glands in the esophagus create mucus to
keep the lining moist and make swallowing easier.

The
wall of the esophagus has several layers. The innermost lining is called the mucosa.
This is made up mainly of flat cells called squamous cells. If stomach acid enters the
lower part of the esophagus (acid reflux) over a long period of time, the squamous cells
can be replaced by glandular cells. Then mucus and other fluids are made to try to
protect the lower part of the esophagus. This is called Barrett’s esophagus.

The
lower end of the esophagus connects to the stomach at the gastroesophageal junction
(GEJ).

What are the types of esophageal cancer?

There are 2 main types of esophageal cancer:

  • Adenocarcinoma. These are cancers that start in
    glandular cells. In the U.S. and other Western countries, most esophageal cancers
    are adenocarcinomas. These cancers normally start in the lower part of the
    esophagus where gland cells have replaced squamous cells.This is what happens in
    Barrett’s esophagus.

  • Squamous cell
    carcinoma.
     These cancers start in squamous cells. This type of cancer can
    start anywhere along the esophagus.

There are other types of esophageal cancer, but they are rare.

How esophageal cancer grows and spreads

Adenocarcinoma of the esophagus often starts in people with Barrett’s esophagus. Still,
most people with Barrett’s esophagus never get esophageal cancer.

Over time, the gland cells that
replace the squamous cells can develop dysplasia. This is when glandular cells start to
look abnormal and grow in an abnormal way. Esophageal dysplasia is a pre-cancerous
condition.

Both
types of esophageal cancer start in the inner lining of the esophagus. As these cancers
grow, they often narrow the opening in the middle of the esophagus. This is called the
lumen. This can cause problems with swallowing.

The cancer can also grow outward,
through the layers of the esophagus to nearby tissues. These include nearby lymph nodes
and the windpipe. Once the cancer has grown outside the esophagus, it can also spread to
other parts of your body. It may spread to other organs, such as your stomach, liver, or
lungs.

Talk with your healthcare provider

If you have questions about esophageal cancer, talk with your healthcare provider. He or she can help you understand more about this cancer.