Oral Cancer

The mouth and throat:

This is about cancers that occur in the mouth and the part of the throat at the back of the mouth. The oral cavity and oropharynx have many parts:

• Lips
• Lining of your cheeks
• Salivary glands
• Roof of your mouth
  
• Back of your mouth
• Floor of your mouth
• Gums and teeth
• Tongue
• Tonsils

Understanding cancer

Cancer begins in cells, the building blocks that make up tissues. Tissues make up the organs of the body.
Normally, cells grow and divide to form new cells as the body needs them. When cells grow old, they die, and new cells take their place.
Sometimes this orderly process goes wrong. New cells form when the body does not need them, and old cells do not die when they should. These extra cells can form a mass of tissue called a growth or tumor.

• Benign tumors (not cancer):
• Benign tumors are rarely life-threatening.
• Generally, benign tumors can be removed, and they usually do not grow back.
• Cells from benign tumors do not invade the tissues around them.
• Cells from benign tumors do not spread to other parts of the body.
• Malignant tumors are cancer:
• Malignant tumors are generally more serious than benign tumors. They may be life-threatening.
• Malignant tumors often can be removed, but sometimes they grow back.
• Cells from malignant tumors can invade and damage nearby tissues and organs.
• Cells from malignant tumors can spread to other parts of the body. The cells spread by breaking away from the original cancer and entering the bloodstream or lymphatic system. They invade other organs, forming new tumors and damaging these organs.

Oral cancers:

Oral cancer is part of a group of cancers called head and neck cancers. Oral cancer can develop in any part of the oral cavity or oropharynx. Most oral cancers begin in the tongue and in the floor of the mouth. Almost all oral cancers begin in the flat cells that cover the surfaces of the mouth, tongue, and lips. These cancers are called squamous cell carcinomas.
When oral cancer spreads, it usually travels through the lymphatic system. Cancer cells that enter the lymphatic system are carried along by lymph, a clear, watery fluid. The cancer cells often appear first in nearby lymph nodes in the neck.
Cancer cells can also spread to other parts of the neck, the lungs, and other parts of the body. When this happens, the new tumor has the same kind of abnormal cells as the primary tumor. For example, if oral cancer spreads to the lungs, the cancer cells in the lungs are actually oral cancer cells. The disease is metastatic oral cancer, not lung cancer. It is treated as oral cancer.