Pituitary Adenoma Causes, Risk Factors and Prevention

A pituitary adenoma develops when cells in the pituitary gland begin to grow uncontrollably. The pituitary is a pea-sized gland at the base of the brain that produces hormones regulating growth, metabolism, reproduction, the body’s stress response and many other essential functions. Most tumors are benign (noncancerous) and occur as isolated cases, although a small percentage are associated with inherited genetic syndromes. While the exact cause is unknown, researchers believe that genetic changes within pituitary cells play an important role in tumor development.

Pituitary adenomas account for approximately 10% to 15% of all tumors that develop within the skull (intracranial tumors). Many are discovered incidentally during imaging performed for an unrelated medical concern, while others are diagnosed after causing symptoms due to a hormonal imbalance or pressure on nearby structures, such as the optic nerves.

What causes pituitary adenoma? 

Researchers have not identified a single cause of pituitary adenoma. Current evidence suggests that several biological mechanisms affecting normal cell growth and hormone regulation may contribute to the development of these tumors, including:

• Acquired DNA abnormalities – Most pituitary adenomas develop after genetic changes occur within pituitary cells during a person’s lifetime rather than being inherited. These changes can affect the mechanisms that regulate normal cell growth.
• Altered cellular signaling – Pituitary cells rely on complex signaling pathways to regulate hormone production and cell division. Disruptions in these pathways may allow abnormal cells to continue multiplying.
• Changes in growth-regulating genes – Certain molecular abnormalities may interfere with proteins that normally limit cell growth or repair damaged DNA.
• Inherited genetic syndromes – Although uncommon, inherited conditions such as multiple endocrine neoplasia type 1 (MEN1), Carney complex and familial isolated pituitary adenoma (FIPA) can increase the likelihood of developing pituitary adenoma.

Although it's not considered cancer, pituitary tumors have serious consequences to body function beyond appearance.

Dr. Andre Beer Furlan

Neurosurgeon

What are the risk factors for pituitary adenoma?  

Most people diagnosed with pituitary adenoma have no known risk factors. However, researchers have identified several characteristics that may increase the likelihood of developing these tumors, such as:

• Increasing age – Pituitary adenoma is diagnosed most often in adults between the ages of 30 and 60, although it can occur at any age.
• Inherited genetic syndromes – Rare hereditary conditions, including MEN1, Carney complex and FIPA, are associated with an increased risk.
• Family history – A family history of pituitary tumors or certain inherited endocrine disorders may increase susceptibility.
• Inherited gene mutations – Mutations associated with hereditary endocrine tumor syndromes can increase the likelihood of developing pituitary adenoma.

Which risk factors for pituitary adenoma are nonmodifiable (factors you cannot change)?

Several factors associated with pituitary adenoma are related to genetics or biological processes that cannot be changed. Recognizing these characteristics may help identify individuals who could benefit from genetic counseling or specialized monitoring.

Nonmodifiable risk factors for pituitary adenoma include:

• Age – Although pituitary adenoma can occur throughout life, it is diagnosed most frequently during adulthood.
• Inherited genetic syndromes – Conditions such as MEN1, Carney complex and FIPA can significantly increase the likelihood of developing pituitary adenoma.
• Family history – A family history of pituitary adenoma or inherited endocrine tumor syndromes may indicate an increased genetic predisposition.
• Inherited gene mutations – Rare inherited genetic alterations affecting endocrine tissues can increase pituitary adenoma risk.

Which risk factors for pituitary adenoma are modifiable (factors you can change)?

Researchers have not identified any proven modifiable risk factors for pituitary adenoma. Unlike many other tumors, pituitary adenoma has not been consistently linked to smoking, alcohol use, diet or other lifestyle factors. Because most cases occur sporadically, there are currently no known lifestyle changes that have been shown to reduce the risk of developing this type of tumor.

Can pituitary adenoma be prevented?

Because the precise cause of most pituitary adenomas remains unknown, there is currently no established way to prevent them. Although prevention is not possible in most cases, early evaluation and ongoing medical care can help identify pituitary tumors before they cause significant complications. Helpful steps include:

• Discussing family medical history with a healthcare provider – Individuals with a family history of pituitary tumors or inherited endocrine syndromes may benefit from genetic counseling and risk assessment.
• Seeking evaluation for unusual symptoms – Persistent symptoms such as vision changes, frequent headaches, unexplained fatigue, menstrual irregularities, infertility and other signs of hormone imbalance should be evaluated promptly.
• Following recommended surveillance plans – People with hereditary endocrine syndromes should participate in routine imaging, hormone testing or other monitoring recommended by their healthcare team.
• Keeping regular follow-up appointments – Ongoing medical care can help detect changes in hormone levels or tumor growth and guide timely treatment.

Find the help you need for pituitary adenoma at Moffitt Cancer Center 

A pituitary adenoma diagnosis can raise important questions about causes, risk factors and treatment. The multispecialty team in Moffitt’s Endocrine Program provides comprehensive evaluations and individualized care for patients with pituitary adenoma and other types of endocrine tumors.

If you would like to learn more about pituitary adenoma causes, risk factors, prevention or treatment options, you can request an appointment with a specialist at Moffitt by calling 1-888-663-3488 or submitting a new patient registration form online. We do not require referrals.