Soft tissue sarcoma begins in the soft – or connective – tissues of the body, such as muscle, fat and blood vessels. There are dozens of  types of soft tissue sarcoma.  One of the more common subtypes of sarcoma in adults is leiomyosarcoma. But with an estimated incidence of 1 in 100,000 people per year, it’s still quite rare compared to lung or colorectal cancer. 

Leiomyosarcoma is believed to originate in the body...