Fibrosarcoma Metastatic

Fibrosarcoma metastatic is a rare and aggressive soft tissue cancer that has spread from its original location to distant parts of the body, most commonly the lungs, bones, or other organs. This advanced stage of the disease requires prompt diagnosis and specialized treatment to manage its spread and improve patient outcomes.

Table of contents

• What Is Fibrosarcoma Metastatic?
• How Fibrosarcoma Spreads
• Signs and Symptoms
• Diagnosis and Testing
• Treatment Options
• Outlook and Prognosis

What Is Fibrosarcoma Metastatic?

Fibrosarcoma metastatic is an advanced form of fibrosarcoma where cancer cells have broken away from the original tumor and traveled to other parts of the body through the bloodstream or lymphatic system^[1]. Even when fibrosarcoma spreads to another area, such as the lungs or bones, it is still considered fibrosarcoma rather than lung or bone cancer^[23].

Fibrosarcoma is a rare type of cancer that originates in cells called fibroblasts, which produce the fibrous tissue found throughout the body in tendons, ligaments, and other connective tissues^[1]. When these cells lose control and multiply excessively, they can form tumors that may eventually spread beyond their original location^[2].

There are two main types of fibrosarcoma: infantile (congenital) fibrosarcoma, which usually appears at birth or shortly after and rarely spreads, and adult-type fibrosarcoma, which is more aggressive and has a higher likelihood of spreading to distant organs^[2]. The adult form is more commonly associated with metastatic disease^[1].

How Fibrosarcoma Spreads

According to research, approximately 83% of metastatic soft tissue sarcomas, including fibrosarcoma, spread to the lungs^[5]. This makes the lungs the most common site for distant spread. Cancer cells can also travel to bones, the peritoneum (the lining of the abdominal cavity), and other organs throughout the body^[5].

When fibrosarcoma becomes metastatic, it is classified as stage 4 sarcoma. About 25% of metastatic soft tissue sarcoma cases develop after initial treatment for the primary tumor^[23]. This means that even after the original tumor has been removed or treated, cancer cells may have already spread to other locations and can grow into new tumors over time.

The spread of cancer occurs when malignant cells break away from the original tumor and enter the bloodstream or lymphatic system, which act as highways throughout the body. These cells can then settle in distant organs and begin growing into new tumors^[1].

Signs and Symptoms

The symptoms of metastatic fibrosarcoma depend on where the cancer has spread and how large the tumors have become. Because fibrosarcoma develops in deep soft tissues, symptoms often do not appear until the tumor grows larger and begins pressing on nearby structures^[2].

General symptoms of fibrosarcoma may include:

• A painless or tender lump in the legs, arms, or trunk^[2]
• Tingling, “pins and needles” sensation, or sharp, aching, or burning pain if the tumor presses on nerves^[2]
• Unusual swelling when the tumor presses on blood vessels^[2]
• Difficulty moving a joint or limb^[4]
• Limping or other difficulty using legs, feet, arms, and hands^[4]

When fibrosarcoma spreads to the lungs, additional symptoms may include:

• Persistent cough^[9]
• Breathlessness or difficulty breathing^[9]

If the cancer spreads to bones, patients may experience persistent pain in the affected area, swelling around the bone, or bones that break easily because they have been weakened by cancer^[9]. When cancer spreads to the abdomen, symptoms can include pain in the abdomen, dark stool, vomiting blood, or irregular bleeding from the vagina^[9].

Diagnosis and Testing

Diagnosing metastatic fibrosarcoma involves several steps to confirm the presence of cancer and determine how far it has spread. The diagnostic process typically begins with a thorough physical examination and imaging studies^[8].

Biopsy is the definitive method for diagnosing fibrosarcoma. A biopsy involves taking a sample of tissue from the tumor for laboratory testing^[7]. This can be done through a core needle biopsy, where a wide needle removes multiple tissue samples, or in select cases, an incisional biopsy that removes part of a lump for testing^[23]. The tissue sample is examined by a pathologist who specializes in diagnosing sarcomas to confirm the diagnosis^[8].

Before any intervention, imaging studies are performed to evaluate the tumor and determine if there are metastases. These may include:

• Plain radiography (X-rays) to evaluate for bone involvement^[8]
• Computed tomography (CT) scans to create detailed images and detect metastatic disease, particularly in the chest to check for lung metastases^[8]
• Magnetic resonance imaging (MRI), which may be the best overall method for examining soft-tissue masses and detecting the extent of tumors^[8]
• Positron emission tomography (PET) scans, which are particularly useful for identifying cancerous tumor cells and for sarcoma types with a tendency to spread to lymph nodes^[8]
• Bone scans to detect spread to bones^[4]

Blood tests, including a complete blood count and blood chemistry tests, may also be performed as part of the diagnostic evaluation^[4].

Once fibrosarcoma has been diagnosed, the tumor is staged. This process indicates how far the tumor has spread from its original location and helps determine the most appropriate treatment approach^[4]. The stage provides important information about prognosis and guides treatment decisions.

Treatment Options

Treatment for metastatic fibrosarcoma depends on several factors, including the size and location of both the primary tumor and metastatic sites, the patient’s overall health, and whether the cancer can be completely removed through surgery^[1].

Surgery remains the primary treatment when possible. The goal is to remove all or most of the primary and metastatic tumors^[23]. The surgeon will remove the tumor along with a margin of normal tissue surrounding it to ensure all cancer cells are removed^[7]. When fibrosarcoma affects the arms and legs, surgeons typically perform limb-sparing surgery to preserve function^[7]. However, in rare cases where cancer has spread extensively throughout a limb, partial or full amputation may be necessary^[7].

Radiation therapy uses high-energy radiation to destroy cancer cells. It can be used before surgery to shrink the tumor and make it easier to remove, or after surgery to kill any remaining cancer cells that were not removed during the operation^[7]. Radiation therapy is commonly used in conjunction with surgery for soft-tissue fibrosarcomas^[12].

Chemotherapy uses anti-cancer drugs to destroy cancer cells throughout the body. While its use in fibrosarcoma is somewhat controversial, chemotherapy is sometimes used when there is a high risk of cancer returning or when it has spread to other parts of the body^[7]. Common chemotherapy drugs used for treating soft tissue sarcomas include doxorubicin and ifosfamide, with gemcitabine and docetaxel used if the first-line drugs are not effective^[23]. Chemotherapy is not routinely used for all fibrosarcoma patients but is considered for large, deep-seated tumors, especially when metastases are present^[15].

If surgery cannot completely remove the cancer, patients may receive radiation therapy or chemotherapy to help shrink and destroy the tumors^[23]. In some cases, targeted therapies and immunotherapies may be considered. Targeted therapy targets specific characteristics within cancer cells to stop them from growing and spreading, while immunotherapy helps a person’s own immune system fight and kill cancer cells^[7]. Researchers have found that some of these newer treatments have shown promise in clinical trials, but more research is needed before they become standard treatment options^[7].

Outlook and Prognosis

The outlook for metastatic fibrosarcoma depends on many interconnected factors. The size and location of the tumor, its grade (how abnormal the cancer cells look under a microscope), and the presence of metastatic disease all significantly impact survival and treatment success^[1].

In a survey of adult fibrosarcomas, 80% were classified as “high-grade” (Grade 2 or 3), with 25% of low-grade lesions progressing to high-grade sarcoma locally over time^[1]. Fibrosarcoma has a mortality rate ranging from 25% to 57%, reflecting its aggressive nature^[3].

Adult-type fibrosarcoma is typically more aggressive and harder to treat than the infantile type^[2]. Unlike infantile fibrosarcoma, which rarely spreads and is usually curable, adult-type fibrosarcoma is highly malignant and has a significant risk of both local recurrence and distant spread^[1].

Poor prognostic factors in adults with soft tissue sarcomas include age older than 60 years, larger tumor size, and the presence of metastatic disease^[17]. Patients diagnosed with metastatic fibrosarcoma should be followed up for many years at regular intervals to monitor for recurrence and further spread of the cancer^[15].

The success of treatment depends heavily on achieving good local control and preventing or managing distant disease spread. Complete surgical removal of tumors with adequate margins remains crucial for the best outcomes^[1]. A tumor that is not removed completely with wide margins has a recurrence rate of almost 100% and is prone to further spread^[15].