Thyroid Cancer: Targeted Therapy
What is targeted therapy?
Targeted therapies are medicines that affect a cancer cell's ability to grow and to
spread. They focus on, or target, one or more changes found mainly on or in cancer
cells, such as certain proteins or gene changes. This means they tend to have very
different side effects than chemotherapy.
Tests can be done on your cancer cells to see if they have the changes that these
medicines target. Many different medicines are used, and there are a lot of different
targets these medicines act on.
When might targeted therapy be used for thyroid cancer?
Targeted therapy is mostly used to treat medullary thyroid cancers (MTCs) and anaplastic
thyroid cancers. The usual iodine- and hormone-based treatments that work for other
types of thyroid cancer don't often work for these cancers.
Papillary, follicular, and Hurthle thyroid cancers that don't respond to the usual
treatments may be treated with targeted therapy, too.
How is targeted therapy given for thyroid cancer?
Targeted therapy is usually managed by an oncologist. The targeted therapy given depends
on your type of thyroid cancer. The targeted therapy medicines used for thyroid cancer
are all taken as pills or capsules. You will take them at home once or twice a day.
Targeted therapy medicines that may be used to treat thyroid cancer include:
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Sorafenib
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Lenvatinib
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Vandetanib
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Cabozantinib
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Selpercatinib
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Pralsetinib
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Larotrectinib
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Entrectinib
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Dabrafenib
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Trametinib
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Sunitinib
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Axitinib
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Everolimus
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Pazopanib
Even though the medicines are taken by mouth, they're still strong and can cause side
effects.
What are common side effects of targeted therapy?
Some of the more common side effects of targeted therapy include:
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Nausea
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Dizziness
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Diarrhea, which may be caused by an inflamed colon (colitis)
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Constipation
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High blood pressure
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Headache
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Severe tiredness (fatigue)
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Decreased appetite
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Weight loss or gain
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Mouth sores
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Skin problems, such as dryness, rash, blisters, or darkening skin
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Problems with wound healing
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Hand-foot syndrome (redness, pain, and swelling in hands or feet)
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Belly (abdomen) pain
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Muscle and joint pain
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Increased levels of blood sugar
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Minor gastric bleeding
Most of these side effects go away or get better over time after treatment ends. There
may be things you can do to help control some of them.
These medicines can also cause severe side effects. They may include infection, changes
in heart rhythm, lung inflammation, damage to the liver, or severe bleeding. But these
are less common. Tell your healthcare providers about any side effects you have. They
can help you cope with the side effects.
Your healthcare provider may do tests of your kidney, thyroid, liver, and other functions
during targeted therapy treatment.
Working with your healthcare provider
It's important to know which medicines you're taking. Write down the names of your
medicines. This includes prescription and over-the-counter medicines. Ask your healthcare
team how they work. Find out what side effects they might cause. Tell them about any
herbs, vitamins, and supplements you take. Some of these might interact with your
targeted therapy.
Talk with your healthcare providers about what symptoms to watch for and what to do
if you have any. Ask them what changes you should call them about. For instance, some
types of targeted therapy can cause rashes that might get worse if not treated right
away. Know what number to call with any questions. Is there a different number for
evenings, weekends, or holidays?
It may be helpful to keep a diary of your side effects. Write down any physical, thinking,
and emotional changes. A written list will make it easier for you to remember your
questions when you go to your appointments. It will also make it easier for you to
work with your healthcare team to make a plan to manage your side effects.