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Questions about rare diseases?
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Disease Information

Summary
Anaplastic thyroid cancer (ATC) accounts for less than 2% of all thyroid cancers and is the most aggressive type of thyroid cancer. Women are more likely to be affected than men. ATC generally occurs in individuals with a history of goiter or thyroid cancer. A history of head and neck radiation or exposure to radioactive materials may also increase the risk for ATC. Patients with ATC generally present with a rapidly-growing neck mass which may cause trouble swallowing (dysphagia), coughing, neck pain, and trouble breathing (dyspnea). Metastasis is present in more than half of individuals at the time of diagnosis. Patients with metastases may also present with bone pain, lymph node enlargement, weakness, and neurological deficits.
Summary
Anaplastic thyroid cancer (ATC) accounts for less than 2% of all thyroid cancers and is the most aggressive type of thyroid cancer. Women are more likely to be affected than men. ATC generally occurs in individuals with a history of goiter or thyroid cancer. A history of head and neck radiation or exposure to radioactive materials may also increase the risk for ATC. Patients with ATC generally present with a rapidly-growing neck mass which may cause trouble swallowing (dysphagia), coughing, neck pain, and trouble breathing (dyspnea). Metastasis is present in more than half of individuals at the time of diagnosis. Patients with metastases may also present with bone pain, lymph node enlargement, weakness, and neurological deficits.Anaplastic thyroid cancer (ATC) accounts for less than 2% of all thyroid cancers and is the most aggressive type of thyroid cancer. Women are more likely to be affected than men. ATC generally occurs in individuals with a history of goiter or thyroid cancer. A history of head and neck radiation or exposure to radioactive materials may also increase the risk for ATC. Patients with ATC generally present with a rapidly-growing neck mass which may cause trouble swallowing (dysphagia), coughing, neck pain, and trouble breathing (dyspnea). Metastasis is present in more than half of individuals at the time of diagnosis. Patients with metastases may also present with bone pain, lymph node enlargement, weakness, and neurological deficits.
Resource(s) for Medical Professionals and Scientists on This Disease:
This section is currently in development.

About Thyroid gland undifferentiated (anaplastic) carcinoma

Many rare diseases have limited information. Currently, GARD aims to provide the following information for this disease:

  • Population Estimate:Fewer than 5,000 people in the U.S. have thisdisease.
  • Symptoms:May start to appear as an Adult and as an Older Adult.
  • Organizations:Patient organizations are available to help find a specialist, or advocacy and support for this specific disease.
  • Categories:CancerEndocrinediseases

Causes

GARD does not currently have information about the cause of this disease.

When Do Symptoms of Thyroid gland undifferentiated (anaplastic) carcinoma Begin?

Symptoms of this disease may start to appear as an Adult and as an Older Adult.

The age symptoms may begin to appear differs between diseases. Symptoms may begin in a single age range, or during several age ranges. The symptoms of some diseases may begin at any age. Knowing when symptoms may have appeared can help medical providers find the correct diagnosis.
Prenatal
Before Birth
Newborn
Birth-4 weeks
Infant
1-23 months
Child
2-11 years
Adolescent
12-18 years
Adult Selected
19-65 years
Older Adult Selected
65+ years
Symptoms may start to appear as an Adult and as an Older Adult.
This information comes from Orphanet

Symptoms

The types of symptoms experienced, and their intensity, may vary among people with this disease. Your experience may be different from others. Consult your health care team for more information.

The following describes the symptom(s) associated with this disease along with the corresponding body system(s), description, synonyms, and frequency (Note: Not all possible symptoms may be listed):
Endocrine System Endocrine System

23 Symptoms

23 Symptoms

23 Symptoms

Endocrine System

The endocrine system is made up of a series of glands that produce and secrete hormones throughout the body, including the thyroid, pituitary, pineal, and adrenal glands, and the thymus, pancreas, testes, and ovaries. When endocrine glands produce too much or too little hormone, health problems such as weight gain, high blood pressure, and changes in sleep, mood, and behavior can occur. Disease of the endocrine can be diagnosed and treated by an endocrinologist.
Medical Term

Anaplastic thyroid carcinoma

Frequency
Uncommon
Always
Always
Always
This section is currently in development.
Open detail view
23 Symptoms
This information comes from the Human Phenotype Ontology (HPO)

Diagnostic Journey

On average, it takes more than six years to receive an accurate rare disease diagnosis. Many primary care providers (PCPs) may not be familiar with rare diseases, and you may need to see multiple specialists to reach the correct diagnosis. However, advocating for yourself with your healthcare team may help speed your time to diagnosis. To combat common challenges, be prepared:

  • Find disease-specific information to discuss with your healthcare providers.
  • Ask for diagnostic tests.
  • Request referrals to specialists.

Knowing where to start your diagnostic journey and how to navigate the next steps are critical to speeding your time to diagnosis

Your Diagnostic Team

How can a diagnostic team help?

Establishing care with a dedicated primary care provider (PCP) is an important early step in your rare disease journey. A PCP can help improve care and shorten the time to diagnosis by providing referrals to the appropriate specialists. These specialists, with advanced training in different body systems or types of diseases, can offer the specialized diagnostic procedures you need.

Use this tool by Medicare to find a PCP in your area by inputting your location and keyword "Primary Care Provider."

Diagnostic teams for Thyroid gland undifferentiated (anaplastic) carcinoma may include:
 

Multidisciplinary Care Centers

Is it time to find a multidisciplinary care center?

If you've visited your PCP, met with specialists, and undergone the recommended tests, but still do not have a confirmed diagnosis, it may be time to visit a multidisciplinary care center. Multidisciplinary care centers are usually teaching, university, or research hospitals that have teams of medical experts and specialists working together in the same location. This means a wide range of diagnostic tests and clinical knowledge are available at one facility, which can help increase communication and collaboration among your care team. The additional resources often available at multidisciplinary centers may help speed the time to diagnosis for rare diseases.

Use this tool to find hospitals that may partner with medical schools and programs in your area.

Multidisciplinary Care Centers

Is it time to find a multidisciplinary care center?

If you've visited your PCP, met with specialists, and undergone the recommended tests, but still do not have a confirmed diagnosis, it may be time to visit a multidisciplinary care center. Multidisciplinary care centers are usually teaching, university, or research hospitals that have teams of medical experts and specialists working together in the same location. This means a wide range of diagnostic tests and clinical knowledge are available at one facility, which can help increase communication and collaboration among your care team. The additional resources often available at multidisciplinary centers may help speed the time to diagnosis for rare diseases.

Use this tool to find hospitals that may partner with medical schools and programs in your area.

Rare Disease Experts

How can you find a rare disease expert?

If a diagnosis remains unknown despite extensive efforts by your PCP and specialists, it can be challenging to know what kind of expert you may need or where to find one. A rare disease expert is a care provider that has knowledge or training on specific disease(s), but there may only be a few experts in your state, region, or country. Rare disease experts may work at large research or teaching hospitals. In complex cases, coordinating with a network of experts can help your care provider find the right diagnosis. 
Contact a GARD Information Specialist for help finding an expert.

You can ask your care providers for help finding an expert or use directory tools to search for experts near you. The National Organization for Rare Disorders (NORD) maintains a list of rare disease centers with experts that work together to find treatments and cures for a broad range of rare diseases. Search NORD's Center Directory to find experts near you.

Rare Disease Experts

How can you find a rare disease expert?

If a diagnosis remains unknown despite extensive efforts by your PCP and specialists, it can be challenging to know what kind of expert you may need or where to find one. A rare disease expert is a care provider that has knowledge or training on specific disease(s), but there may only be a few experts in your state, region, or country. Rare disease experts may work at large research or teaching hospitals. In complex cases, coordinating with a network of experts can help your care provider find the right diagnosis. 
Contact a GARD Information Specialist for help finding an expert.

You can ask your care providers for help finding an expert or use directory tools to search for experts near you. The National Organization for Rare Disorders (NORD) maintains a list of rare disease centers with experts that work together to find treatments and cures for a broad range of rare diseases. Search NORD's Center Directory to find experts near you.
 

Find Your Community

How Can Patient Organizations Help?

Patient organizations can help patients and families connect. They build public awareness of the disease and are a driving force behind research to improve patients' lives. They may offer online and in-person resources to help people live well with their disease. Many collaborate with medical experts and researchers.

Services of patient organizations differ, but may include:

  • Ways to connect to others and share personal stories
  • Easy-to-read information
  • Up-to-date treatment and research information
  • Patient registries
  • Lists of specialists or specialty centers
  • Financial aid and travel resources


Please note: GARD provides organizations for informational purposes only and not as an endorsement of their services. Please contact an organization directly if you have questions about the information or resources it provides.

View GARD's criteria for including patient organizations, which can be found under the FAQs on our About GARD page. Request an update or to have your organization added to GARD. 

Patient Organizations

5 Organizations

Organization Name

Who They Serve

Helpful Links

Country

ThyCa: Thyroid Cancer Survivors' Association, Inc.
People With

Thyroid gland undifferentiated (anaplastic) carcinoma

Helpful Links
Country

United States

EveryLife Foundation for Rare Diseases
People With

Rare Diseases

Helpful Links
Country

United States

Genetic Alliance
People With

Rare Diseases

Helpful Links
Country

United States

Global Genes
People With

Rare Diseases

Helpful Links
Country

United States

National Organization for Rare Disorders
People With

Rare Diseases

Helpful Links
Country

United States

Participate in Research

Clinical studies are a part of clinical research and play an important role in medical advances for rare diseases. Through clinical studies, researchers may ultimately uncover better ways to treat, prevent, diagnose, and understand human diseases.

What Are Clinical Studies?

Clinical studies are medical research involving people as participants. There are two main types of clinical studies:

  1. Clinical trials determine if a new test or treatment for a disease is effective and safe by comparing groups receiving different tests/treatments.
  2. Observational studies involve recording changes over time among a specific group of people in their natural settings.
Learn more about clinical trials from this U.S. Food & Drug Administration webpage.

Why Participate in Clinical Studies?

People participate in clinical trials for many reasons. People with a disease may participate to receive the newest possible treatment and additional care from clinical study staff as well as to help others living with the same or a similar disease. Healthy volunteers may participate to help others and to contribute to moving science forward.

To find the right clinical study we recommend you consult your doctors, other trusted medical professionals, and patient organizations. Additionally, you can use ClinicalTrials.gov to search for clinical studies by disease, terms, or location.

What if There Are No Available Clinical Studies?

ResearchMatch helps connect people interested in research studies  with researchers from top medical centers across the United States. Anyone from the U.S. can register with this free program funded by NIH. Researchers from participating institutions use the database to search for and invite patients or healthy volunteers who meet their study criteria to participate.

Join the All of Us Research Program!

The All of Us Research Program is inviting 1 million people from all backgrounds across the U.S. to help build one of the most diverse health databases in history. Researchers will use the data to learn how our biology, lifestyle, and environment affect health. This may one day help them find ways to treat and prevent diseases.

What Are Clinical Studies?

Clinical studies are medical research involving people as participants. There are two main types of clinical studies:
  1. Clinical trials determine if a new test or treatment for a disease is effective and safe by comparing groups receiving different tests/treatments.
  2. Observational studies involve recording changes over time among a specific group of people in their natural settings.
Learn more about clinical trials from this U.S. Food & Drug Administration webpage.
Read More

Why Participate in Clinical Studies?

People participate in clinical trials for many reasons. People with a disease may participate to receive the newest possible treatment and additional care from clinical study staff as well as to help others living with the same or a similar disease. Healthy volunteers may participate to help others and to contribute to moving science forward.

To find the right clinical study we recommend you consult your doctors, other trusted medical professionals, and patient organizations. Additionally, you can use ClinicalTrials.gov to search for clinical studies by disease, terms, or location.
Read More

What if There Are No Available Clinical Studies?

ResearchMatch helps connect people interested in research studies  with researchers from top medical centers across the United States. Anyone from the U.S. can register with this free program funded by NIH. Researchers from participating institutions use the database to search for and invite patients or healthy volunteers who meet their study criteria to participate.

Join the All of Us Research Program!

The All of Us Research Program is inviting 1 million people from all backgrounds across the U.S. to help build one of the most diverse health databases in history. Researchers will use the data to learn how our biology, lifestyle, and environment affect health. This may one day help them find ways to treat and prevent diseases.

ClinicalTrials.gov, an affiliate of NIH, provides current information on clinical research studies in the United States and abroad. Talk to a trusted doctor before choosing to participate in any clinical study. We recommend checking this site often and searching for studies with related terms/synonyms to improve results.
Search ClinicalTrials.gov for this disease.
Contact a GARD Information Specialist if you need help finding more information on this rare disease or available clinical studies. Please note that GARD cannot enroll individuals in clinical studies.
1-888-205-2311
Available toll-free Monday through Friday from 12 pm to 6 pm Eastern Time
(Except: Federal Holidays)
Contact GARD
Use the contact form to send your questions to a GARD Information Specialist.

Please allow 2 to 10 business days for us to respond.
ClinicalTrials.gov, an affiliate of NIH, provides current information on clinical research studies in the United States and abroad. Talk to a trusted doctor before choosing to participate in any clinical study. We recommend checking this site often and searching for studies with related terms/synonyms to improve results.
Search ClinicalTrials.gov for this disease.
Contact a GARD Information Specialist if you need help finding more information on this rare disease or available clinical studies. Please note that GARD cannot enroll individuals in clinical studies.
1-888-205-2311
Available toll-free Monday through Friday from 12 pm to 6 pm Eastern Time
(Except: Federal Holidays)
Contact GARD
Use the contact form to send your questions to a GARD Information Specialist.

Please allow 2 to 10 business days for us to respond.

Last Updated: February 2025