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Navigating Your Diagnosis: A Guide to Endocrine Tumors

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Endocrine tumors are abnormal growths in the body's hormone-producing glands. They can be 'functional' (secreting excess hormones that cause full-body symptoms) or 'non-functional.' Treatment requires specialized imaging, pathology grading, and a multidisciplinary care team.

Key Takeaways

  • • Endocrine tumors form in hormone-producing glands like the thyroid, pituitary, adrenal glands, or digestive tract.
  • • Functional endocrine tumors actively secrete hormones, which can cause severe, full-body symptoms by throwing off your body's chemical balance.
  • • Diagnosis and staging rely on highly specialized imaging and pathology markers, such as the Ki-67 index, to determine tumor grade.
  • • Family history is important, as some endocrine tumors are linked to inherited genetic syndromes like MEN1 and MEN2.
  • • Managing an endocrine tumor requires a collaborative, multidisciplinary care team to handle both tumor growth and hormone regulation.

The endocrine system is a vast and vital network of glands that produce hormones—the chemical messengers that regulate almost every function in your body, from your heart rate and metabolism to your mood and growth. When the cells within these glands begin to grow abnormally, they can form tumors.

Being diagnosed with an endocrine tumor can feel incredibly overwhelming, largely because these tumors behave very differently than common cancers like breast or lung cancer. Endocrine tumors don’t just take up physical space; because they are born from hormone-producing tissues, they can sometimes actively secrete hormones, throwing your entire body’s chemical balance into chaos.

Whether you are dealing with a tumor of the thyroid, the pituitary gland in your brain, the adrenal glands above your kidneys, or a neuroendocrine tumor (NET) in your digestive tract, knowledge is your most powerful tool. This guide is designed to break down the complex biology, diagnosis, and treatment of endocrine tumors into clear, actionable information so you can confidently partner with your medical team.

Please explore the following pages to understand your diagnosis and build a strategic plan for your care:

Frequently Asked Questions

What is the difference between a functional and non-functional endocrine tumor?
A functional endocrine tumor actively secretes hormones, which can disrupt your body's chemical balance and cause widespread symptoms like flushing or rapid heart rate. A non-functional tumor does not produce excess hormones and usually only causes symptoms if it presses on surrounding tissues.
What are the common symptoms of an endocrine tumor?
Symptoms vary depending on which gland is affected and whether the tumor secretes hormones. You may experience systemic issues like sudden skin flushing, unexplained diarrhea, racing heart rate, and fatigue, or localized symptoms like headaches, vision changes, and fullness in the neck or abdomen.
What does the Ki-67 index mean on my pathology report?
The Ki-67 index is a percentage on your pathology report that indicates how fast the tumor cells are growing and dividing. A lower Ki-67 number generally means a slow-growing tumor, while a higher number suggests a faster-growing, more aggressive tumor.
Why is a Multidisciplinary Tumor Board (MDT) important for my care?
Because endocrine tumors are complex and behave differently than common cancers, they require specialized expertise. An MDT ensures that doctors from different fields—such as endocrinologists, oncologists, and surgeons—collaborate to build the most effective, personalized treatment plan for you.

Questions for Your Doctor

  • • Which specific endocrine gland is the primary site of my tumor?
  • • Is my tumor considered a specific neuroendocrine tumor (NET) or a general endocrine tumor (like thyroid or pituitary)?
  • • Is my tumor 'functional' (producing hormones) or 'non-functional'?
  • • What is the 'grade' of my tumor, and what was the Ki-67 index on my pathology report?
  • • Has my case been reviewed by a Multidisciplinary Tumor Board (MDT)?

Questions for You

  • • Have I noticed any unusual systemic symptoms like sudden skin flushing, unexplained diarrhea, racing heart rate, or extreme fatigue?
  • • Am I experiencing localized symptoms, such as new headaches, vision changes, or a feeling of fullness in my neck or abdomen?
  • • Do any of my close biological relatives have a history of endocrine tumors, rare genetic syndromes, or early-onset high blood pressure?
  • • Am I keeping a log of all my symptoms, test results, and imaging reports to share with my care team?

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This guide provides educational information about endocrine tumors and is not a substitute for professional medical advice. Always consult your multidisciplinary care team to discuss your specific diagnosis, pathology reports, and treatment options.

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