What are the risk factors for soft tissue sarcoma?

Soft tissue sarcoma is a type of cancer that arises in the tissues that connect and support the body's organs, such as muscles, fat, blood vessels, and nerves. Although the exact causes of these tumors often remain unknown, there are several factors that may increase the likelihood of developing them, including inherited genetic disorders, prior radiation therapy, or exposure to certain harmful chemicals [1]. It is important to realize that the presence of these factors does not necessarily mean you will develop the disease, and sarcoma can also appear in individuals who do not have any of these known factors [2].

Genetic Factors and Inherited Syndromes

Genetics play a significant role in increasing the risk of soft tissue sarcoma. Research indicates a link between the disease and certain specific genetic syndromes that are passed down through generations. Prominent among these are Li-Fraumeni syndrome, resulting from a mutation in the TP53 gene; neurofibromatosis type 1, caused by a mutation in the NF1 gene; and Gardner syndrome, associated with an APC gene mutation [1]. The list also includes nevoid basal cell carcinoma syndrome (Gorlin syndrome), tuberous sclerosis (related to TSC1 or TSC2 mutations), and Werner syndrome, which is known for premature aging [2].

Environmental Factors and Prior Medical Exposure

External factors are considered triggers that may induce cellular changes leading to tumor growth. Among these is previous radiation therapy, as exposure to radiation is linked to an increased risk of developing the disease later. There is also evidence that occupational or environmental exposure to certain chemicals, such as vinyl chloride, arsenic, and thorium dioxide (Thorotrast), may contribute to an increased risk [1].

Chronic Medical Conditions and Viral Infections

Certain long-term health conditions affect the chances of sarcoma development. For example, chronic lymphedema in the limbs (arms or legs) may increase the risk of these tumors forming in those areas. Additionally, viral factors play a specific role, as infection with HIV and human herpesvirus 8 (HHV-8) is associated with an increased risk of Kaposi sarcoma [1].

Early Diagnosis and Challenges

Soft tissue sarcoma often begins as a painless lump or swelling under the skin. In deep areas such as the abdomen, obvious symptoms may not appear until the tumor grows large enough to press on nearby nerves or organs, which may cause pain or difficulty breathing. An accurate diagnosis requires a biopsy and specialized microscopic analysis [1]. For a deeper understanding of how these tumors are detected and managed, you can view our specialized article on Soft Tissue Sarcoma: Diagnosis, Treatment, and Challenges (Arabic).

Always remember that clinical examination by specialists is the only way to verify any new lumps or symptoms, especially if you have a family history of the mentioned genetic syndromes.

Medical references

• Soft Tissue Sarcoma Treatment (PDQ®)–Patient Version
• Childhood Soft Tissue Sarcoma (PDQ®)–Patient Version