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This phase II trial studies the effect of hypofractionated radiotherapy followed by surgery in treating patients with soft tissue sarcoma. Hypofractionated radiation therapy delivers higher doses of radiation therapy over a shorter period of time and may kill more tumor cells and have fewer side effects. Giving hypofractionated radiotherapy followed by surgery may allow patients with sarcomas to be treated in a much more rapid and convenient fashion.

Study SPH4336-US-01 is an open-label (no placebo), multicenter clinical trial to evaluate the
safety, blood levels (pharmacokinetics) and preliminary anti-tumor effects of SPH4336, a
selective enzyme blocker, in patients with specific types of liposarcomas (tumors expressing
the target of the study drug).

This clinical trial studies the effect of the ERAS pain management method in managing pain after surgery in patients with extremity soft tissue sarcoma. Enhanced Recovery After Surgery, or ERAS, is a pain management method that places emphasis on managing risk factors (things like smoking, nutrition and fitness), using multiple types of pain control, and early movement, with the goal of improving patient outcomes. ERAS has been shown to reduce the length of time some patients stay in the hospital, reduce complications from surgery, and even lower costs of some surgeries. ERAS is designed may help cut down on the use of these narcotics in managing the pain of surgery patients. The purpose of this trial is to demonstrate that ERAS is safe and effective for patients having surgery to treat their sarcoma. Specifically, this study will look at using a non-narcotic pain management program that includes other methods of managing the pain of sarcoma surgery patients.