 The world needs more heroes. More action-oriented do-gooders. More, here's how I can help, right-hand men and women. The world of sarcoma is no different. And if you're thinking, what is sarcoma? We're glad you're listening. Sarcoma is a rare cancer of the body's soft tissue in bone. A cancer affecting tens of thousands of Americans every year. A cancer that has more than 70 subtypes, many of which require unique treatment options at various stages of discovery.