Although the cause of soft tissue sarcoma is unknown, research into this is ongoing. Sarcomas, like other cancers, are not infectious and can’t be passed on to other people.

Age

Sarcomas can occur at any age but are more common in people over 30.

Genetic conditions

Most sarcomas are not caused by an inherited faulty gene that can be passed on to other family members. Members of your family are not likely to have an increased risk of developing a soft tissue sarcoma just because you have.

However, people who have some rare inherited genetic conditions are more at risk of developing a sarcoma. These conditions include neurofibromatosis, Gardner syndrome, Li-Fraumeni syndrome and retinoblastoma. You would normally know if any member of your family had one of these conditions, and their doctor would check them regularly for any sign of a sarcoma.

Previous radiotherapy treatment

Very rarely, soft tissue sarcomas may occur in a part of the body that has previously been treated with radiotherapy for another type of cancer. The sarcoma will not usually develop until at least 5–10 years after the radiotherapy treatment. Improvements in giving radiotherapy treatment mean that the risk of developing a sarcoma is very small.

Exposure to chemicals

The development of some sarcomas may be linked to exposure to some types of chemicals. The chemicals include: vinyl chloride, which is used for making plastics; some types of herbicides (weedkillers); and dioxins, which are a waste product produced during the manufacture of chemicals and fertilisers.

Injury

There is no evidence that an injury can cause a soft tissue sarcoma to develop. It’s possible that an injury may draw attention to a sarcoma that was already there and not causing any symptoms, but the sarcoma will have taken many years to develop.