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International randomised controlled trial of chemotherapy for the treatment of recurrent and primary refractory Ewing sarcoma

Study ID: 17239
Short Title: rEECur
Trust Name: UHS
Recruitment Site: Southampton General Hospital
Disease Area: CYP Sarcoma
Phase: III
II
Expected End Date: 30/09/2025
Postcode: SO16 6YD
Contact Name: Amanda Pattie
Contact Email: studysupport1and3.crnwessex@nihr.ac.uk
Active: Yes

1. Histologically confirmed Ewing sarcoma. 2. Disease recurrence or progression after completion of first line treatment OR Refractory disease, defined by progression during first line treatment or within 12 weeks of its completion. Disease progression will be based on Response Evaluation Criteria In Solid Tumors (RECIST). The appearance of new bone lesions on bone scan will require confirmation with crosssectional imaging. 3. Soft tissue disease component evaluable by crosssectional imaging. Patients with bone disease without a measurable soft tissue component or bone marrow disease only will be eligible for the study but will not contribute to the phase II primary outcome measure. 4. Age ≥4 years and < 50 years. 5. Patient assessed as medically fit to receive cytotoxic chemotherapy. 6. Documented negative pregnancy test fr female patients of childbearing potential. 7. Patient agrees to use effective contraception during therapy and for 12 months. after last trial treatment (females) or 5 months after last trial treatment (males), where applicable. 8. Written informed consent from the patient and/or legal guardian.

1.Bone marrow infiltration resulting in absolute neutrophil count (ANC) < 1.0 x 109/l or platelets < 75 x 109/l 2.Cytotoxic chemotherapy or other investigational medicinal product (IMP) within previosu two weeks. 3.Myeloablative therapy within previous eight weeks. 4.Radiotherapy to target lesion within previous six weeks. 5.Pregnant or breastfeeding women. 6.Followup not possible due to social, geographic or psychological reasons.

rEECur is a randomised study to compare four chemotherapy regimens to see which is the best at treating recurrent or refractory Ewing sarcoma. Ewing sarcoma is a type of bone cancer. Recurrent Ewing sarcoma means Ewing sarcoma that has come back after being treated. Refractory Ewing sarcoma means Ewing sarcoma that has grown or progressed while being treated. Ewing sarcoma is rare and running a study such as this requires funding and collaboration across many different treatment centres and countries. The logistics behind running such a study are not trivial and as a result rEECur is the first study to directly compare different chemotherapy regimens in this disease setting. Most doctors treat recurrent and refractory Ewing sarcoma with chemotherapy. However, although several chemotherapy regimens are available to treat this disease, we do not know which is the best regimen to use. We are primarily interested in finding out which regimen is most effective at making tumour deposits shrink and, in the longer term, at curing the disease or providing prolonged disease control. We will also determine which regimen has the most side effects, which is associated with the most time spent in hospital and which has the greatest effect on quality of life. The results will help us to know which chemotherapy regimen is the best to use for patients with this disease. It will also allow us to inform patients about the relative burden of side effects associated with each regimen, allowing individual patients and/or parents to make an informed choice about how to be treated.

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