Liposarcoma

In most cases, the exact cause of liposarcoma cannot be clearly identified. In many soft tissue sarcomas, genetic changes are thought to play a role. These changes can disrupt normal cell growth and maturation. At the same time, most liposarcomas develop without any clear trigger.

Known risk factors include:

• Ionizing radiation, for example after previous radiation therapy or other exposure
• Chemical carcinogens
• Certain tumor syndromes, such as Li-Fraumeni syndrome
• Older age, depending on the subtype

The best proven link is with previous radiation therapy. A small proportion of soft tissue sarcomas can develop years after earlier radiation. Liposarcomas can also belong to this group of radiation-associated sarcomas. In addition, inherited genetic predisposition syndromes can increase the general risk of soft tissue sarcomas.

Unlike some other cancers, liposarcoma usually has no typical lifestyle cause. It is therefore important to have suspicious swellings checked early. This is especially true for deep or growing masses.

Liposarcoma symptoms depend mainly on where the tumor grows. They also depend on how deep it is and how large it has become. In the early stages, liposarcoma often causes few or no symptoms. Because liposarcomas grow in deeper tissue layers, they are often noticed only once they are larger. Common sites include the thigh, other parts of the legs, the back, and the abdominal or pelvic area. Retroperitoneal liposarcoma is especially important here.

Possible symptoms of liposarcoma include:

• A growing, usually painless swelling or mass
• A lump that can be felt
• A feeling of pressure or tightness
• Pain, especially if nerves or other structures are displaced
• Limited movement or functional problems
• Back pain or soft tissue discomfort
• Pressure in the abdomen or an increasing abdominal size
• Weight loss or reduced general performance in more advanced stages

Retroperitoneal liposarcomas often remain unnoticed for a long time. The abdominal cavity has a lot of space. For this reason, symptoms may appear late and may be vague. They can include stomach pain, increasing abdominal size, pressure or symptoms caused by displaced organs. In the arms or legs, a slowly growing swelling is usually noticed over time.

Important warning signs include a new or growing soft tissue swelling, a deep lump or a mass larger than about 5 cm. Symptoms that increase over time and cannot be explained should also be checked. Because liposarcoma often causes only mild symptoms at first, early diagnosis is important.

The diagnosis of liposarcoma is usually made step by step. It often includes a clinical examination, imaging, tissue sampling and, depending on the subtype, molecular pathology. The first suspicion often arises when a deep and slowly growing mass is found. Because liposarcoma can occur in soft tissue or in the retroperitoneum, further tests are needed. They help assess the size, spread and relation to nearby structures.

Imaging is therefore an important part of the diagnosis. Tumors in the arms or legs can often be shown well with MRI. MRI can also show the relation between the tumor and muscles, fascia, blood vessels and nerves. For retroperitoneal liposarcoma, CT is often used. It can show the spread in the abdominal and pelvic area. It can also show whether nearby organs are being displaced.

The diagnosis is finally confirmed with an image guided core needle biopsy. This method is used for many forms of liposarcoma. It is much less invasive than an open biopsy. The tissue sample is then examined under the microscope. This shows whether the tumor is a liposarcoma and which subtype is present. This step is especially important because well differentiated, dedifferentiated, myxoid and pleomorphic liposarcoma differ clearly in diagnosis and treatment.

Molecular methods are also becoming more important. They can help detect certain genetic changes. This can support the exact classification of the subtype. It can also help distinguish liposarcoma from benign soft tissue tumors.

The aim of liposarcoma treatment is to slow and control tumor growth. Treatment also aims to prevent recurrence and improve the chance of long term control. Surgery is an important part of treatment. The goal is complete removal of the tumor. In localized liposarcoma, surgical resection offers the best basis for long term tumor control.

Chemotherapy does not have the same role in every liposarcoma. It may be used in advanced, inoperable or metastatic disease. Well differentiated liposarcomas often respond only partly to systemic therapy. In more aggressive forms, such as dedifferentiated, myxoid or pleomorphic liposarcoma, chemotherapy may help in specific situations. Newer targeted and immuno-oncology approaches are also being studied, especially in advanced disease. At present, they do not replace the basic treatment approach. This usually consists of surgery and, when appropriate, radiation therapy.

The liposarcoma prognosis depends mainly on the subtype, location, tumor size, whether surgery is possible and whether metastases are present. Well differentiated liposarcoma therefore often has a more favorable prognosis. However, it can recur locally. Dedifferentiated and pleomorphic liposarcomas behave more aggressively. Retroperitoneal tumors often have a less favorable prognosis. They are often diagnosed later and can be harder to remove.

Complementary measures may also be used alongside liposarcoma treatment. They can help support quality of life, relieve symptoms and support the body during treatment. These measures may include complementary medicine, mistletoe therapy, vitamins, minerals, herbal preparations and, in some cases, homeopathic remedies. Oncological hyperthermia is also often used as a supportive element. Since liposarcoma belongs to the soft tissue sarcomas, local warming is used to improve blood flow in the tissue. It may gently support the effect of conventional therapies. The aim is to correct deficiencies, support regeneration and relieve the body during treatment phases. It is important that complementary methods are chosen individually. They should also be coordinated with the main cancer treatment.

The information listed contains relevant topics and serves to improve understanding.