Trial of Neoadjuvant Conformal Radiotherapy Plus Sorafenib for Patients With Soft Tissue Sarcoma of the Extremity and Body Wall

Study Summary

Patients will receive neoadjuvant sorafenib (investigational agent) in combination with preoperative external beam conformal radiotherapy (50 Gy in 25 fractions) for localized, large soft tissue sarcomas of the extremity and body wall prior to resection with curative intent. Sorafenib is an FDA-approved targeted agent for patients with renal cell carcinoma and hepatocellular carcinoma. Preliminary data suggest activity for sorafenib against soft tissue sarcoma in the metastatic setting. Limited data are available regarding the safety and efficacy of sorafenib in combination with radiotherapy. The Phase I portion of the trial will seek to establish the safety of sorafenib and radiotherapy in the neoadjuvant setting for soft tissue sarcomas of the extremity and body wall. The Phase II portion of the trial will aim to determine the pathologic near-complete/complete response rate (≥ 95% tumor necrosis) of this multimodality therapy. Molecular and dynamic contrast-enhanced MRI studies will seek to establish correlative biological and imaging markers of response and/or resistance to this therapy.

Primary Outcome

Number of dose limiting toxicities and number with adverse events. Dose-escalation schedule comprising 6 to 12 patients (see schema). This sample size is based on a traditional 3+3 cohort design with escalating doses of sorafenib in combination with 50 Gy of conformal radiotherapy delivered in 25 fractions (200 cGy per fraction). Based on preclinical data regarding the radiobiology of sorafenib,33, 36 sorafenib will be initiated at a dose of 200 mg twice daily, followed by 200 mg Q AM/400 mg Q

Interventions

• DRUG Sorafenib