Radiation Therapy With or Without Combination Chemotherapy or Pazopanib Before Surgery in Treating Patients With Newly Diagnosed Non-rhabdomyosarcoma Soft Tissue Sarcomas That Can Be Removed by Surgery

PRIMARY OBJECTIVES: I. To identify the dose of pazopanib that is feasible when given in combination with radiation or chemoradiation in pediatric and adult patients newly diagnosed with unresected intermediate- and high-risk non rhabdomyosarcoma soft tissue sarcomas (NRSTS). II. To compare the rates of near complete pathologic response (\> 90% necrosis) with the addition of pazopanib to preoperative chemoradiation versus preoperative chemoradiation alone for potentially resectable \> 5 cm, grade 2 or 3 intermediate to high risk chemotherapy-sensitive NRSTS in the phase II portion of the study for this cohort. III. To compare the rates of near complete pathologic response (\> 90% necrosis) with the addition of pazopanib to preoperative radiotherapy versus preoperative radiotherapy alone for potentially resectable intermediate to high risk adult and pediatric NRSTS in the phase II portion of the study for this cohort (using a phase II decision rule to go onto the phase III portion of the study). IV. To compare the rates of event-free survival (EFS) with the addition of pazopanib to preoperative radiotherapy versus preoperative radiotherapy alone for localized intermediate to high risk adult and pediatric NRSTS in the phase III portion of the study for this cohort if the phase II decision rule is passed. SECONDARY OBJECTIVES: I. To estimate the rates of local failure, regional failure, distant metastasis free survival, disease-free survival, and overall survival with the addition of pazopanib to preoperative chemoradiation or preoperative radiation in intermediate to high risk adult and pediatric NRSTS. II. To compare the pattern of recurrence (local, regional and distant) between preoperative chemoradiation or radiation with the addition of pazopanib for adult and pediatric NRSTS. III. To define the toxicities of ifosfamide and doxorubicin chemotherapy and radiation when used in combination with pazopanib in intermediate to high risk adult and pediatric NRSTS. IV. To define the toxicities of preoperative radiotherapy when used in combination with pazopanib in intermediate to high risk adult and pediatric NRSTS. EXPLORATORY OBJECTIVES: I. To gain insight into the disease biology of childhood and adult NRSTS through analysis of actionable mutations and whole genome sequencing. II. To determine if microvessel density and circulating tumor deoxyribonucleic acid (DNA) predict response to pazopanib and outcome. III. To determine the effect of pazopanib on doxorubicin exposure in children and adults with NRSTS. IV. To evaluate change in fludeoxyglucose F 18 (FDG) positron emission tomography (PET) maximum standard uptake value (SUVmax) from baseline to week 10 or 13 in patients with unresected tumors and to correlate this change with pathologic response and EFS. V. To compare the rate of response by standard imaging and pathologic assessment to determine which correlates better with local tumor control, distant tumor control, EFS, and overall survival. OUTLINE: This study starts as a dose-escalation study of pazopanib. CHEMOTHERAPY COHORT: Patients eligible for chemotherapy cohort are randomized to 1 of 2 treatment regimens. REGIMEN A: INDUCTION PHASE: Patients receive pazopanib orally (PO) once daily (QD) on weeks 1-12, ifosfamide intravenously (IV) over 2-4 hours on days 1-3 on weeks 1, 4, 7, 10, and doxorubicin IV over 1-15 minutes on days 1-2 on weeks 1 and 4. At least 24 hours after the completion of week 4 doxorubicin, patients undergo radiation therapy on weeks 4-10. SURGERY: Patients undergo surgery on week 13. CONTINUATION PHASE: Patients receive pazopanib PO QD on weeks 16-25, ifosfamide IV over 2-4 hours on days 1-3 on weeks 16 and 19, and doxorubicin IV over 1-15 minutes on days 1-2 on weeks 16, 19, and 22. If applicable, patients undergo additional radiation therapy at week 16 REGIMEN B: INDUCTION PHASE: Patients receive ifosfamide IV over 2-4 hours on days 1-3 on weeks 1, 4, 7, 10 and doxorubicin hydrochloride IV over 1-15 minutes on days 1-2 on weeks 1 and 4. At least 24 hours after the completion of week 4 doxorubicin, patients undergo radiation therapy on weeks 4-10. SURGERY: Patients undergo surgery on week 13. CONTINUATION PHASE: Patients receive ifosfamide IV over 2-4 hours on days 1-3 on weeks 16 and 19 and doxorubicin IV over 1-15 minutes on days 1-2 on weeks 16, 19, and 22. If applicable, patients undergo additional radiation therapy at week 16. NON-CHEMOTHERAPY COHORT: Patients eligible for non-chemotherapy cohort are randomized to 1 of 2 treatment regimens. REGIMEN C: INDUCTION PHASE: Patients receive pazopanib PO QD on weeks 1-9. Patients undergo radiation therapy on weeks 1-7. SURGERY: Patients undergo surgery on week 10. CONTINUATION PHASE: Patients receive pazopanib PO QD on weeks 13-25. If applicable, patients undergo additional radiation therapy at week 13. REGIMEN D: INDUCTION PHASE: Patients undergo radiation therapy on weeks 1-7. SURGERY: Patients undergo surgery on week 10. CONTINUATION PHASE: If applicable, patients undergo additional radiation therapy at week 13. After completion of study treatment, patients are followed up at 6, 12, 18, 24, 30, 36, 48, and 60 months.