Adrenal Cancer Causes and Risk Factors

Adrenal cancer is a rare disease where abnormal cells grow in the adrenal glands, small organs located above your kidneys. While the exact causes are often unknown, certain inherited genetic conditions and syndromes can increase your risk. Understanding these factors is important for early detection and management, though many cases develop without a clear identifiable cause.

What is Adrenal Cancer Causes and Risk Factors?

Adrenal cancer is a rare type of cancer that begins in one or both of your adrenal glands, which are small hormone-producing organs located on top of each kidney. While the exact causes are often unknown, certain genetic conditions and syndromes can increase your risk of developing this disease.

Your adrenal glands are vital organs that produce hormones essential for many bodily functions, such as regulating metabolism, blood pressure, and your body's response to stress. Adrenal cancer occurs when abnormal cells in these glands grow out of control, forming a tumor. This condition is very uncommon, affecting about 1 in 1 million people each year. Adrenal tumors can be either benign (non-cancerous) or malignant (cancerous). Benign tumors are much more common and do not spread to other parts of the body. Malignant adrenal tumors, or adrenal cortical carcinomas, are cancerous and can invade nearby tissues or spread to distant organs. This content focuses on the causes and risk factors specifically for malignant adrenal cancer.

Symptoms

Symptoms of adrenal cancer often arise from the excess hormones produced by the tumor or from the tumor pressing on nearby organs. These can include unexplained weight changes, high blood pressure (hypertension), muscle weakness, or abdominal pain, and may vary depending on which hormones are affected.

Adrenal tumors can produce too much of certain hormones, leading to a variety of symptoms. For example, an excess of cortisol, a stress hormone, can cause weight gain, easy bruising, high blood sugar, and muscle weakness. Too much aldosterone, which regulates blood pressure, can lead to high blood pressure (hypertension) and low potassium levels. If the tumor produces excess sex hormones, women might experience increased facial hair growth, a deeper voice, or male-pattern baldness. Men might develop enlarged breasts (gynecomastia) or tenderness. Children might show signs of early puberty. These hormonal changes are often the first noticeable signs of adrenal cancer. Beyond hormonal effects, a growing tumor can also cause symptoms by pressing on nearby organs. This might lead to abdominal pain, a feeling of fullness, or back pain. It is important to remember that these symptoms can be caused by many other, less serious conditions, but persistent or worsening symptoms should always be evaluated by a doctor.

Causes & risk factors

The specific cause of adrenal cancer is often unknown, but certain inherited genetic conditions significantly increase your risk. These include syndromes like Li-Fraumeni syndrome, Multiple Endocrine Neoplasia type 1 (MEN1), Beckwith-Wiedemann syndrome, and Carney complex, which involve specific gene changes.

Most cases of adrenal cancer are considered "sporadic," meaning they occur without a clear inherited cause or family history. However, a small number of cases are linked to inherited genetic syndromes. These syndromes involve specific gene mutations that make a person more susceptible to developing various cancers, including adrenal cancer. Key genetic syndromes linked to an increased risk include: * **Li-Fraumeni syndrome:** This is an inherited condition caused by a mutation in the TP53 gene. People with Li-Fraumeni syndrome have a higher risk of developing several types of cancer, including adrenal cancer, at a younger age. * **Multiple Endocrine Neoplasia type 1 (MEN1):** This syndrome results from a mutation in the MEN1 gene. It causes tumors in several endocrine glands, such as the parathyroid, pituitary, and pancreas, and can also increase the risk of adrenal tumors. * **Beckwith-Wiedemann syndrome:** This is a genetic disorder that affects growth and development, often leading to an increased risk of childhood cancers, including adrenal cancer, and other conditions like an enlarged tongue or umbilical hernia. * **Carney complex:** This rare inherited disorder causes benign and cancerous tumors in various parts of the body, including the heart, skin, and endocrine glands like the adrenal glands. Adrenal cancer can occur at any age, but it often shows a bimodal pattern, meaning it is more common in children under the age of 5 and in adults between their 40s and 50s. Unlike many other cancers, there are no consistently identified lifestyle risk factors, such as smoking, diet, or exposure to specific chemicals, that are clearly linked to developing adrenal cancer.

How it's diagnosed

Diagnosing adrenal cancer typically involves a combination of imaging tests, blood and urine tests to check hormone levels, and sometimes a biopsy. These tests help doctors determine the tumor's size, location, and whether it is producing excess hormones, which guides further treatment decisions.

If adrenal cancer is suspected, your doctor will likely begin with a physical exam and review your medical history. The diagnostic process then usually involves several steps to confirm the presence of a tumor and determine its characteristics. **Imaging tests** are crucial for visualizing the adrenal glands and any tumors. These may include a computed tomography (CT) scan, magnetic resonance imaging (MRI), or positron emission tomography (PET) scan. These scans help determine the tumor's size, location, and whether it has spread to other parts of the body. **Blood and urine tests** are performed to check for abnormal levels of hormones produced by the adrenal glands. This often involves a 24-hour urine collection to measure hormone output over an entire day, as well as blood tests for specific hormones like cortisol, aldosterone, DHEA, testosterone, and estrogen. High levels of these hormones can indicate a functional adrenal tumor. A **biopsy**, which involves taking a small tissue sample from the tumor for examination under a microscope, is sometimes used to confirm cancer. However, doctors may be cautious about performing a biopsy on adrenal tumors before surgery if imaging strongly suggests cancer, due to a small risk of spreading cancer cells. In many cases, the tumor is removed surgically first, and then the diagnosis is confirmed by examining the entire tumor.

Treatment options

Treatment for adrenal cancer depends on the cancer's stage, size, and whether it has spread. The primary treatment is usually surgery to remove the tumor and affected adrenal gland. Other options may include radiation therapy, chemotherapy, or targeted drug therapy, often used in combination.

The main goal of treatment for adrenal cancer is to remove the tumor completely. For localized cancer that has not spread, **surgery (adrenalectomy)** is the most common and often the most effective treatment. This procedure involves removing the entire adrenal gland containing the tumor. If the cancer has spread to nearby tissues or lymph nodes, these may also be removed during surgery. After surgery, or if the cancer has spread too far for surgery alone, other treatments may be used. **Radiation therapy** uses high-energy X-rays or other types of radiation to kill cancer cells or stop them from growing. It can be used to destroy remaining cancer cells after surgery or to relieve symptoms if the cancer has spread to other areas, such as bones. **Chemotherapy** uses drugs to kill cancer cells throughout the body. Mitotane is a specific chemotherapy drug often used for adrenal cancer, especially for advanced or recurrent cases. It works by destroying adrenal cortical cells. Other chemotherapy drugs may also be used in combination. **Targeted therapy** is a newer approach that uses drugs designed to specifically attack cancer cells by targeting certain genes, proteins, or other molecules involved in cancer growth and survival, while minimizing harm to healthy cells.

Recovery & outlook

The outlook for adrenal cancer varies greatly depending on factors like the cancer's stage at diagnosis, its size, and whether it has spread. Early detection and complete surgical removal offer the best chance for a positive outcome, but regular follow-up care is crucial to monitor for recurrence.

Adrenal cancer is an aggressive cancer, and the prognosis depends heavily on how early it is diagnosed and treated. Cancers that are small and confined to the adrenal gland (Stage I or II) at the time of diagnosis generally have a better outlook than those that have spread to nearby tissues or distant organs (Stage III or IV). After treatment, regular follow-up appointments are essential. These typically include physical exams, blood tests to check hormone levels, and imaging scans (like CT or MRI) to monitor for any signs of cancer recurrence. The frequency of these follow-up visits will depend on your specific situation and the stage of your cancer. If one adrenal gland is removed, the remaining gland can usually produce enough hormones for the body's needs. However, if both adrenal glands are removed, or if the remaining gland does not function adequately, you will need lifelong hormone replacement therapy to replace the hormones your body can no longer produce. This helps manage your body's essential functions and maintain your quality of life.

When to see a doctor

You should see a doctor if you experience persistent or unexplained symptoms that could be related to adrenal cancer, such as new high blood pressure, unexplained weight changes, muscle weakness, or abdominal pain. Early evaluation is important, especially if you have a family history of genetic syndromes linked to adrenal cancer.

While many of the symptoms associated with adrenal cancer can be caused by more common, less serious conditions, it is always wise to consult a healthcare professional if you notice any new or concerning changes in your health. Pay particular attention to symptoms that are persistent, worsening, or occur without a clear explanation. Specific symptoms that warrant medical attention include: * New or worsening high blood pressure (hypertension). * Unexplained weight gain or loss. * New muscle weakness or easy bruising. * Changes in body hair or voice (e.g., increased facial hair in women, deeper voice). * Persistent abdominal pain or a feeling of fullness in your abdomen. If you have a family history of genetic syndromes like Li-Fraumeni syndrome, MEN1, Beckwith-Wiedemann syndrome, or Carney complex, discuss this with your doctor. They may recommend regular screenings or earlier evaluation if symptoms arise. In rare cases, severe symptoms like sudden, intense abdominal pain, confusion, or rapid heart rate could indicate an adrenal crisis, which is a medical emergency requiring immediate attention.

Frequently asked questions

Is adrenal cancer hereditary?

Adrenal cancer is hereditary in a small number of cases, linked to specific genetic syndromes like Li-Fraumeni syndrome, MEN1, Beckwith-Wiedemann syndrome, and Carney complex. These conditions involve inherited gene mutations that increase a person's risk. Most cases, however, are sporadic and do not have a clear inherited cause.

Can lifestyle choices cause adrenal cancer?

Unlike many other cancers, there is no strong evidence to suggest that specific lifestyle choices, such as smoking, diet, or lack of exercise, directly cause adrenal cancer. The causes are often unknown, or linked to rare genetic syndromes rather than environmental or lifestyle factors.

How rare is adrenal cancer?

Adrenal cancer is considered very rare. It affects approximately 1 in 1 million people each year. This makes it one of the less common types of cancer, often leading to challenges in early diagnosis due to its rarity and non-specific symptoms.

What's the difference between a benign and malignant adrenal tumor?

A benign adrenal tumor is non-cancerous and does not spread to other parts of the body. It may still cause symptoms if it produces excess hormones. A malignant adrenal tumor, also known as adrenal cortical carcinoma, is cancerous, can invade nearby tissues, and has the potential to spread (metastasize) to distant organs.

Do all adrenal tumors produce hormones?

No, not all adrenal tumors produce hormones. Tumors that produce excess hormones are called "functional" tumors and often cause symptoms related to those hormones. Tumors that do not produce hormones are called "non-functional" and may only cause symptoms if they grow large enough to press on nearby organs.

What is the most common age for adrenal cancer?

Adrenal cancer can occur at any age, but it shows a bimodal pattern. This means it is more commonly diagnosed in two age groups: young children, typically under the age of 5, and adults, most often between their 40s and 50s.

Sources

• MedlinePlus — Adrenal Cancer Causes and Risk Factors
• Mayo Clinic — Adrenal Cancer Causes and Risk Factors
• Cochrane Library — Adrenal Cancer Causes and Risk Factors