Source: Cancer Resource Room

What is Thyroid Cancer?
Thyroid cancer is a disease in which cancer (malignant) cells are found in the tissues of the thyroid gland. The thyroid gland is at the base of the throat. It has two lobes, one on the right side and one on the left. The thyroid gland makes important hormones that help the body function normally.

Certain factors may increase the risk of developing thyroid cancer.

• Thyroid cancer occurs more often in people between the ages of 25 and 65 years.
• People who have been exposed to radiation or received radiation treatments to the head and neck during infancy or childhood have a greater chance of developing thyroid cancer. The cancer may occur as early as 5 years after exposure or may occur 20 or more years later.
• People who have had goiter (enlarged thyroid) or a family history of thyroid disease have an increased risk of developing thyroid cancer.
• Thyroid cancer is more common in women than in men.
  Asian people have an increased risk of developing thyroid cancer.

What are the symptoms of thyroid cancer?
How is thyroid cancer diagnosed?
A doctor should be seen if there is a lump or swelling in the front of the neck or in other parts of the neck.

If there are symptoms, a doctor will feel the patient’s thyroid and check for lumps in the neck. The doctor may order blood tests and special scans to see whether a lump in the thyroid is making too many hormones. The doctor may want to take a small amount of tissue from the thyroid. This is called a biopsy. To do this, a small needle is inserted into the thyroid at the base of the throat and some tissue is drawn out. The tissue is then looked at under a microscope to see whether it contains cancer.

There are four main types of thyroid cancer (based on how the cancer cells look under a microscope):

1. papillary
2. follicular
3. medullary
4. anaplastic

Some types of thyroid cancer grow faster than others. The chance of recovery (prognosis) depends on the type of thyroid cancer, whether it is in the thyroid only or has spread to other parts of the body (stage), and the patient’s age and overall health. The prognosis is better for patients younger than 40 years who have cancer that has not spread beyond the thyroid.

The genes in our cells carry the hereditary information from our parents. An abnormal gene has been found in patients with some forms of thyroid cancer. If medullary thyroid cancer is found, the patient may have been born with a certain abnormal gene which may have led to the cancer. Family members may have also inherited this abnormal gene. Tests have been developed to determine who has the genetic defect long before any cancer appears. It is important that the patient and his or her family members (children, grandchildren, parents, brothers, sisters, nieces and nephews) see a doctor about tests that will show if the abnormal gene is present. These tests are confidential and can help the doctor help patients. Family members, including young children, who don’t have cancer, but do have this abnormal gene, may reduce the chance of developing medullary thyroid cancer by having surgery to safely remove the thyroid gland (thyroidectomy).

Stages of thyroid cancer
Once thyroid cancer is found (diagnosed), more tests will be done to find out if cancer cells have spread to other parts of the body. This is called staging. A doctor needs to know the stage of the disease to plan treatment.

Papillary and follicular thyroid cancer
The following stages are used for papillary and follicular thyroid cancer:

• Stage I
  In patients younger than 45 years, cancer may have spread within the neck or upper chest and/or to nearby lymph nodes but not to other parts of the body.
  In patients aged 45 years and older, the tumor is 2 centimeters (about ¾ inch) or smaller and in the thyroid only.
• Stage II
  In patients younger than 45 years, the cancer has spread to distant parts of the body, such as the lung or bone, and may have spread to nearby lymph nodes.
  In patients aged 45 years and older, the tumor is larger than 2 centimeters but not larger than 4 centimeters (between ¾ and 1½ inches) in the thyroid only.
• Stage III
  The cancer is found in patients aged 45 years or older. The tumor either:
  • is larger than 4 centimeters; or
  • may be any size and has spread just outside the thyroid and/or to lymph nodes in the neck.
• Stage IVA
  The cancer is found in patients aged 45 years or older. The tumor may be any size and has spread within the neck and/or to lymph nodes in the neck or upper chest.
• Stage IVB
  The cancer is found in patients aged 45 years or older. The tumor may be any size and has spread to neck tissues near the backbone or around blood vessels in the neck or upper chest. Cancer may have spread to lymph nodes.
• Stage IVC
  The cancer has spread to other parts of the body, such as the lung or bone, and may have spread to nearby lymph nodes.

Medullary thyroid cancer
The following stages are used for medullary thyroid cancer:

• Stage 0
  No tumor is found in the thyroid but the cancer is detected by screening tests. Stage 0 is also called carcinoma in situ.
• Stage I
  The tumor is 2 centimeters or smaller and in the thyroid only.
• Stage II
  The tumor is larger than 2 centimeters but not larger than 4 centimeters and is in the thyroid only.
• Stage III
  The tumor either:
  • is larger than 4 centimeters; or
  • may be any size and has spread just outside the thyroid and/or to lymph nodes in the neck.
• Stage IVA
  The tumor may be any size and has spread within the neck and/or to lymph nodes in the neck or upper chest.
• Stage IVB
  The tumor may be any size and has spread to neck tissues near the backbone or around blood vessels in the neck or upper chest. Cancer may have spread to lymph nodes.
• Stage IVC
  Cancer has spread to other parts of the body, such as the lung or bone, and may have spread to nearby lymph nodes.

Anaplastic thyroid cancer
Anaplastic thyroid cancer is considered to be stage IV thyroid cancer. It grows quickly and has usually spread within the neck when it is found. Anaplastic thyroid cancer develops most often in older people.

Recurrent thyroid cancer
Recurrent disease means that the cancer has come back (recurred) after it has been treated. It may come back in the thyroid or in other parts of the body.

Read more about Thyroid Cancer >>>

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