Which are the causes of Pheochromocytoma?

TL;DR: Pheochromocytoma is a rare tumor of the adrenal gland that develops from chromaffin cells, which produce excess stress hormones like adrenaline. While the exact cause for most cases remains unknown, approximately 30-40% of patients have a hereditary genetic mutation that predisposes them to developing the condition.

What causes Pheochromocytoma to develop?

A Pheochromocytoma arises when specialized cells in the center of the adrenal gland, called chromaffin cells, begin to grow uncontrollably. In a healthy body, these cells release hormones like adrenaline and noradrenaline in response to stress. In a Pheochromocytoma, these cells malfunction and secrete these hormones continuously, regardless of whether the body is under stress. For the majority of cases—roughly 60-70%—the cause is sporadic, meaning it occurs spontaneously without a clear underlying genetic cause or known environmental trigger. Research is ongoing to determine if somatic (non-inherited) mutations or epigenetic changes play a larger role in these sporadic cases.

Is Pheochromocytoma hereditary?

Yes, Pheochromocytoma is hereditary in a significant portion of cases. If you have been diagnosed with this condition, genetic counseling is often recommended because several specific gene mutations are linked to its development. These mutations often exist as part of a larger genetic syndrome. The most common genetic associations include:

• Von Hippel-Lindau (VHL) syndrome: Mutations in the VHL gene.


• Multiple Endocrine Neoplasia type 2 (MEN2): Mutations in the RET proto-oncogene.


• Neurofibromatosis type 1 (NF1): Mutations in the NF1 gene.


• Succinate dehydrogenase (SDH) complex mutations: Specifically mutations in SDHB, SDHC, or SDHD genes.

What is the difference between a cause and a risk factor?

In the context of Pheochromocytoma, a "cause" refers to the direct mechanism—such as a genetic mutation—that triggers the cellular transformation into a tumor. A "risk factor," by contrast, is a characteristic or exposure that increases the likelihood of the disease occurring. Currently, there are no well-established environmental risk factors, such as diet or lifestyle habits, that are proven to cause Pheochromocytoma. The primary "risk factor" is simply having a family history of the condition or a known genetic predisposition, which alerts clinicians to perform more frequent screenings.

What does current research tell us about the etiology?

Medical researchers are currently working to decode the complex molecular pathways that lead to Pheochromocytoma. Recent studies focus on the "pseudohypoxia" pathway, where mutations (particularly in SDH genes) trick the cell into acting as if it is deprived of oxygen. This metabolic shift forces the cell to change its energy production and hormone secretion patterns. By understanding these specific pathways, researchers hope to develop targeted therapies that can stop tumor growth without the need for invasive surgery. With 165 community members on DiseaseMaps.org sharing their experiences, we are learning more about how these genetic variants influence the clinical journey of patients worldwide.

Next steps

• Consult a genetic counselor: Discuss whether genetic testing is appropriate for you or your family members.


• Endocrine evaluation: Ensure you are under the care of an endocrinologist experienced in managing adrenal tumors.


• Join the community: Connect with the 165 members on DiseaseMaps.org to share experiences and find support.


• Stay informed: Monitor clinical trial databases like ClinicalTrials.gov for the latest research on targeted treatments.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Pheochromocytoma


• Orphanet: Rare disease database entry for Pheochromocytoma


• OMIM (Online Mendelian Inheritance in Man): Genetic basis of Pheochromocytoma


• The Endocrine Society: Clinical Practice Guidelines for Pheochromocytoma and Paraganglioma