A Study Evaluating Limited Target Volume Boost Irradiation and Reduced Dose Craniospinal Radiotherapy (18.00 Gy) and Chemotherapy in Children With Newly Diagnosed Standard Risk Medulloblastoma: A Phase III Double Randomized Trial

This randomized phase III trial is studying how well standard-dose radiation therapy works
compared to reduced-dose radiation therapy in children 3-7 years of age AND how well standard
volume boost radiation therapy works compared to smaller volume boost radiation therapy when
given together with chemotherapy in treating young patients who have undergone surgery for
newly diagnosed standard-risk medulloblastoma. Radiation therapy uses high-energy x-rays to
damage tumor cells. Drugs used in chemotherapy, such as vincristine, cisplatin, lomustine,
and cyclophosphamide, work in different ways to stop tumor cells from dividing so they stop
growing or die. Giving radiation therapy with chemotherapy after surgery may kill any
remaining tumor cells. It is not yet known whether standard-dose radiation therapy is more
effective than reduced-dose radiation therapy when given together with chemotherapy after
surgery in treating young patients with medulloblastoma.