BACKGROUND: Thyroid cancer is a disease that happens when abnormal cells begin to grow in the thyroid gland. The thyroid gland is a buttery shaped glad in the front of the neck that makes hormones to regulate the way the body uses energy and that help the body work normally. It is the fastest growing cancer in the United States. While the cause of thyroid cancer is unknown, experts believe that like other types of cancer changes in the DNA of the cells play a role. People who have been exposed to a lot of radiation have a greater chance of getting thyroid cancer. (Source: webmd.com)
SYMPTOMS: Several symptoms can result from thyroid cancer:
Trouble breathing or constant wheezing
Pain in the neck or ears
Lumps or swelling in the neck (the most common symptom)
TREATMENT: If there is a lump in the neck, then a doctor will take a biopsy of the thyroid gland to check for cancer cells. A biopsy is a simple procedure in which a small piece of the thyroid tissue is removed. Sometimes the result of the biopsy is not clear and often times results in surgery. (Source: webmd.com)
NEW TECHNOLOGY: Half a million nodules are biopsied each year and 20 to 30 percent of these are inconclusive. A ground breaking new test, called the gene expression test, measures inconclusive tissue. It measures 142 gene patterns that are present in thyroid cancer and can tell if the nodule is benign or malignant. The test is an ultrasound-guided needle biopsy that can accurately identify 62 to 85 percent of thyroid nodules as benign. This new breakthrough can help people avoid expensive unnecessary surgeries. (Source: uphs.upenn.edu)
Paul Aoun, DO, PhD, Endocrinologist at Palm Beach Diabetes & Endocrine Specialists, talks about a new genomic test to identify if a questionable thyroid nodule biopsy is benign or suspicious for cancer – which can help some patients avoid unnecessary surgery.
What are the reasons that people come to check their thyroid?
Dr. Aoun: There are several reasons for which people come to have their thyroid checked. One is having symptoms and/or laboratory tests suggestive of either under or overproduction of thyroid hormones. Another reason is that people notice something in their neck such as a lump that upon further evaluation is determined to be a thyroid nodule, or growth in the thyroid gland.
How common are those nodules?
Dr. Aoun: Thyroid nodules are very common. In fact, among people over the age of fifty, fifty percent or more will have thyroid nodules. So, it’s more common to have thyroid nodules over that age than to not have thyroid nodules.
But what are they looking for, when you’re at home and you feel a lump? What is it you’re looking for exactly?
Dr. Aoun: The majority of thyroid nodules are not felt at home. They’re usually picked up by the physician during an exam or through something we call an incidental finding. That is when a CT scan or an ultrasound of the neck done for another reason, picks up a thyroid nodule.
So most of the time it’s something that they have no idea about?
Dr. Aoun: Exactly.
How dangerous can it get?
Dr. Aoun: It’s not very dangerous. The majority of nodules are small and benign. If they get too large to the point that they start causing compressive symptoms, such as pushing against the windpipe or the esophagus, then patients might experience changes in their voices or complain of food getting stuck in their throats.
So if it gets picked up by the exam you get a biopsy?
Dr. Aoun: The next step is to get an ultrasound and thyroid blood tests. If the thyroid function tests are okay and the nodule warrants being biopsied, I will then proceed to fine needle aspiration, or FNA.
So how invasive is this?
Dr. Aoun: It’s not very invasive. We clean the neck, spray some numbing medication, use a thin needle to get a few samples from the nodule and we send the collected cells for analysis.
What are usually the findings?
Dr. Aoun: There are four possible outcomes. It could come back as benign, which is the most common finding. A second possibility is malignant or suspicious for cancer. A third option is non-diagnostic, which means, the sample is suboptimal and thus a diagnosis cannot be made. In up to twenty to thirty percent of cases at most, we get inconclusive or indeterminate results, which means that the makeup of the nodule is not clear-cut to help make a definitive diagnosis.
So benign is good, it means that you’re good to go, no surgery.
Dr. Aoun: Correct, if the result is benign, then there is no need for surgery, and we usually continue to monitor those patients with serial ultrasounds, as needed. If a benign nodule gets too large and starts causing problems, then surgery is warranted. If the nodule is cancerous, then the recommended next step is surgery. If the FNA result is, non-diagnostic, we usually repeat the biopsy. For nodules with indeterminate findings, the traditional approach had been to send the patient to surgery. This recommendation, however, has been modified after cytogenetic testings, such as the Afirma test, have become available.
So what are you removing when you go in to surgery?