Sarcoma is a cancerous growth developing in the cells of the connective tissue. Primary cancers that develop in the soft connective tissues such as in the muscles, nerves, blood vessels, and fat cells, are called soft tissue sarcomas, versus osseous sarcomas, which develop in hard connective tissue such as in the bones and cartilage. Connective tissue is abundantly present everywhere in the body, and therefore soft tissue sarcomas can occur anywhere. However, the most common locations for soft tissue sarcomas are in the arms and legs, followed by the organs in the abdominal cavity. While it is a rare type of cancer and constitutes about 1% of all adult cancers, the American Cancer Society estimates that in 2015, approximately 12,000 adults will be newly diagnosed with soft tissue sarcoma, and 4,870 adults may die due to this disease.