Angiosarcoma – Diagnostics – Overview of Information and Clinical Research

Angiosarcoma is a rare and aggressive cancer that begins in the cells lining blood vessels or lymph vessels. Because these vessels run throughout the entire body, this disease can appear almost anywhere, though it most commonly affects the skin of the head, neck, and breast. Understanding how this cancer is diagnosed is crucial for anyone who notices unusual skin changes or persistent symptoms.

Who Should Undergo Diagnostics and When to Seek Medical Attention

If you notice symptoms that persist or worry you, it’s important to make an appointment with your healthcare provider. Angiosarcoma can develop in anyone, but certain groups of people should be especially watchful. People who have received radiation therapy in the past, particularly for breast cancer treatment, face a higher risk and should monitor their skin carefully for changes. The disease typically appears several years after radiation exposure, often around eight to ten years later, though it can take even longer to develop.^[14]

Those who have chronic lymphedema (long-lasting swelling caused by fluid buildup in tissues) should also be alert to changes in the affected areas. This swelling often occurs in the arms or legs and can increase the chance of developing angiosarcoma. Additionally, individuals who have been exposed to certain industrial chemicals like vinyl chloride, arsenic, or thorium dioxide may face elevated risk, sometimes decades after exposure.^[2]^[10]

Angiosarcoma most commonly occurs in older adults, particularly those aged 60 and above, though it can affect people at any age. It appears slightly more often in men than women. People with certain genetic conditions or family history of related syndromes should discuss screening options with their doctor.^[14]

When angiosarcoma appears on the skin, you might notice a raised area that looks like a bruise but doesn’t fade away like a normal bruise would. Instead, this discolored patch may grow larger over time. The area might be purplish, reddish, or blue, and it may bleed easily when bumped or scratched. Sometimes it appears as a sore that refuses to heal or continues to grow. These signs on the scalp, face, neck, or breast area warrant prompt medical evaluation.^[1]^[8]

⚠️ Important

When angiosarcoma forms deep inside the body in organs like the liver or heart, symptoms may not appear until the tumor grows large enough to affect how the organ works. You might experience fatigue, unexplained weight loss, or pain near the affected area. Shortness of breath is the most common symptom when angiosarcoma affects the heart. If you have these symptoms along with known risk factors, seek medical attention promptly.

Classic Diagnostic Methods

Diagnosing angiosarcoma requires multiple steps, as this rare cancer can be difficult to identify and distinguish from other conditions. Your healthcare provider will begin with a thorough physical examination, carefully looking at and feeling any lumps, skin changes, or areas of concern. During this exam, your doctor will ask detailed questions about when you first noticed symptoms, whether they’ve changed over time, and your medical history including any previous radiation treatment or chemical exposures.^[11]

Imaging Tests

After the physical exam, imaging tests help doctors see inside your body and determine the size and location of any tumors. Several different imaging techniques may be used depending on where the suspected angiosarcoma is located. Magnetic resonance imaging (MRI) uses powerful magnets and radio waves to create detailed pictures of soft tissues and is particularly useful for examining tumors in detail. Computed tomography (CT) scans use X-rays taken from different angles to create cross-sectional images of your body, helping doctors see the tumor’s relationship to surrounding structures.^[4]^[11]

Ultrasound imaging uses sound waves to create pictures of the inside of your body and can be helpful for examining lumps under the skin or in organs like the liver. For certain cases, doctors may order a positron emission tomography (PET) scan, which uses a small amount of radioactive material to highlight areas where cancer cells are more active. This test is particularly useful for determining whether the cancer has spread to other parts of your body. Bone scans may also be performed if there’s concern about cancer spreading to bones.^[4]

These imaging tests are completely noninvasive, meaning they don’t require cutting into your body. They help doctors plan the best approach for taking a tissue sample and for potential treatment. However, imaging alone cannot confirm whether a growth is angiosarcoma, which is why a biopsy is essential.

Biopsy

A biopsy is the definitive way to diagnose angiosarcoma. During this procedure, your doctor removes a small sample of the suspicious tissue so it can be examined under a microscope by a specialist called a pathologist. There are different types of biopsies, and which one you receive depends on the tumor’s location and size. Your doctor might use a needle to withdraw a small core of tissue, or they may perform an excisional biopsy, which removes the entire suspicious area along with a small margin of normal tissue around it.^[7]^[11]

Once the tissue sample reaches the laboratory, pathologists examine the cells to see if they have the characteristic features of angiosarcoma. They also perform immunohistochemical analysis, which involves using special stains and chemicals to identify specific proteins on the cell surfaces. This testing can reveal whether the cells originated from blood vessel linings, confirming the diagnosis of angiosarcoma and distinguishing it from other types of cancer or benign conditions.^[2]

Blood and Urine Tests

Your doctor may order blood and urine tests as part of your overall diagnostic workup. While these tests cannot diagnose angiosarcoma directly, they provide important information about your general health and how well your organs are functioning. This information helps your medical team plan treatment and identify any complications the cancer may have caused.^[4]

Cardiac-Specific Testing

When angiosarcoma is suspected in the heart, additional specialized tests are necessary. A transthoracic echocardiogram is a noninvasive test that uses sound waves to create moving pictures of your heart. A transesophageal echocardiogram provides more detailed images by placing a small probe down your throat into your esophagus, which sits right behind the heart. Doctors may also perform cardiac catheterization, where a thin tube is threaded through blood vessels to reach the heart, allowing direct visualization and measurement of pressures inside heart chambers.^[9]

⚠️ Important

Because angiosarcoma is extremely rare, accurate diagnosis requires expertise. Sometimes initial biopsies are read as other conditions, particularly benign vascular lesions. If you have a diagnosis that doesn’t seem to match your symptoms or if you’ve been told you have a vascular lesion that keeps growing, seeking a second opinion from a specialist experienced in rare cancers can be valuable.

Diagnostics for Clinical Trial Qualification

Clinical trials test new treatments for angiosarcoma and may offer additional options beyond standard therapies. However, participating in a clinical trial requires meeting specific criteria, and diagnostic tests play a crucial role in determining whether you qualify. These qualification requirements exist to ensure that the trial can accurately measure whether the new treatment works and to keep participants safe.^[3]

For clinical trial enrollment, you will typically need complete documentation of your angiosarcoma diagnosis through biopsy and immunohistochemical analysis. The trial organizers need to verify that you definitely have angiosarcoma rather than another type of cancer, as different cancers respond differently to treatments. Your biopsy slides may be sent to a central laboratory for review to confirm the diagnosis meets the trial’s exact criteria.

Comprehensive imaging studies are essential for clinical trial qualification because researchers need to establish a baseline measurement of your tumors. This baseline allows them to determine later whether the experimental treatment is shrinking, stabilizing, or failing to control your cancer. You may need fresh MRI, CT, or PET scans performed within a specific timeframe before starting the trial, even if you had these tests done recently for your initial diagnosis. The images must be of sufficient quality and may need to follow specific protocols so they can be compared to future scans taken during the trial.^[3]

Blood tests are routinely required for clinical trial screening. These tests check your blood cell counts, liver function, kidney function, and other markers of organ health. Many experimental treatments can only be given safely to people whose organs are functioning well enough to process and eliminate the drugs. If your blood tests show that your liver or kidneys aren’t working properly, you might not qualify for certain trials. Blood tests may also look for specific genetic mutations or biomarkers that predict whether you’re likely to respond to the treatment being studied.

The stage of your cancer matters significantly for clinical trial eligibility. Some trials only accept patients with locally advanced disease that cannot be removed by surgery, while others focus on metastatic disease where cancer has spread to distant organs. Still other trials might be testing treatments as an addition to surgery for early-stage disease. Your diagnostic imaging helps establish what stage your angiosarcoma has reached. Trials may require that you have measurable disease, meaning tumors that can be clearly seen and measured on scans so researchers can track whether they’re responding to treatment.

Performance status evaluations assess how well you can carry out daily activities and care for yourself. Clinical trials often use standardized scales to measure this, and your scores on these assessments can determine eligibility. Some trials accept only patients who are relatively healthy and active, while others specifically study treatments for people whose disease has made them less able to function independently.

Your prior treatment history affects clinical trial qualification. Some trials only accept patients who haven’t yet received any chemotherapy or other cancer treatments, while others specifically study what happens when standard treatments have stopped working. You may need to wait a certain amount of time after completing previous treatments before joining a new trial. Documentation of all your past treatments, including surgeries, radiation therapy, and medications, is necessary for the trial team to determine if you meet their criteria.

Cardiac function testing is particularly important if you’re considering trials that test drugs known to affect the heart or if your angiosarcoma involves the heart itself. You may need an electrocardiogram or echocardiogram to ensure your heart can tolerate the experimental treatment. Similarly, lung function tests might be required for certain trials, especially those involving drugs that could affect breathing.

Genetic and molecular testing of your tumor tissue is becoming increasingly important for clinical trial qualification. Researchers have identified certain genetic mutations and molecular changes in some angiosarcomas that might make them more likely to respond to targeted therapies. Your tumor sample may be tested for these specific alterations, and only patients whose tumors have the targeted changes will qualify for trials studying drugs designed to attack those particular molecular abnormalities.^[3]

Prognosis and Survival Rate

Prognosis

The outlook for people with angiosarcoma depends on several important factors. The location of the cancer significantly affects prognosis. People with small tumors on the skin that can be completely removed with surgery tend to have better outcomes than those with tumors in internal organs like the heart or liver. When angiosarcoma is found early and the entire tumor can be removed with clear margins (meaning all cancer cells are taken out along with some surrounding healthy tissue), the chances of long-term survival improve considerably.^[16]

The stage at diagnosis plays a crucial role in determining prognosis. Angiosarcoma that is detected when it’s still localized (stage 1 or 2) generally has a more favorable outlook than cancer that has already spread to lymph nodes or distant organs (stage 3 or 4). Unfortunately, angiosarcoma has a high tendency to spread to other parts of the body, particularly the lungs, liver, and bones. Many people are not diagnosed until their cancer has already metastasized, which significantly worsens the prognosis.^[2]^[10]

Angiosarcoma of the heart has an especially poor prognosis because it’s often invasive and difficult to remove completely with surgery. It frequently spreads to other organs before diagnosis occurs. Similarly, angiosarcoma of the liver carries a particularly grave outlook. In contrast, some cases of breast angiosarcoma, particularly low-grade tumors, may have better survival rates than other forms of this disease.^[9]^[16]

Even after successful treatment, angiosarcoma has high rates of local recurrence, meaning the cancer comes back in or near the same place it started. This aggressive behavior contributes to the overall challenging prognosis. The cancer’s highly malignant nature and tendency to infiltrate surrounding tissues make achieving complete removal difficult.^[7]

Survival Rate

Overall, the five-year survival rate for people with angiosarcoma ranges from approximately 30 to 38 percent. This means that roughly three to four out of every ten people diagnosed with angiosarcoma are alive five years after their diagnosis. However, these statistics represent averages across all types and stages of angiosarcoma, and individual outcomes can vary significantly.^[2]^[10]

For people with advanced or metastatic angiosarcoma (where the cancer has spread to distant parts of the body), the overall survival typically ranges from only 6 to 16 months. The rate of advanced or metastatic disease at the time of initial diagnosis varies from 16 to 44 percent in different studies, highlighting how often this cancer is caught at a late stage.^[10]

Cardiac angiosarcoma has an especially poor prognosis, with survival sometimes measured in just months rather than years. In the most severe cases involving the heart or liver, prognosis may be as low as three months. These stark statistics reflect the aggressive nature of angiosarcoma in these vital organs and the difficulty of treating it effectively.^[2]

It’s important to understand that survival statistics are based on past cases and may not fully reflect outcomes with newer treatments being developed. Individual prognosis depends on many personal factors including age, overall health, how well the tumor responds to treatment, and whether it can be completely removed surgically. If you want specific information about your own prognosis, it’s essential to have a detailed conversation with your healthcare team, who can consider all aspects of your individual situation.^[16]

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