vary, but they often present as firm, oftentimes painless lumps or nodules. Gastrointestinal stromal tumors (GIST, a subtype of soft-tissue sarcoma) often are asymptomatic, but can be associated with vague complaints of abdominal pain, bleeding into the intestines, a feeling of fullness, or other signs of intestinal obstruction.

Cause

Causes and risk factors

The cause of most bone sarcomas is not known, but several factors are associated with an increased risk of developing bone sarcoma. Previous exposure to ionizing

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