Please assess the completion status of the following clinical trial:

Trial Title: Radiation Therapy Plus Combination Chemotherapy in Treating Children With Medulloblastoma

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: None
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: SINGLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
DISEASE CHARACTERISTICS: Pathologically confirmed posterior fossa medulloblastoma (CCG diagnosis code 2041) Localized disease required, i.e.: No more than 1.5 square centimeters of residual tumor on postoperative contrast-enhanced CT or MRI (preferably within 72 hours but no more than 14 days after surgery) No evidence of metastatic disease on pre- and postoperative MRI of spine (with dye enhancement) and lumbar cerebrospinal fluid (CSF) cytology within 3 days prior to surgery Cytologic analysis of ventricular CSF allowed only if medical contraindication to lumbar puncture and with approval of study chairperson Brain stem involvement eligible~PATIENT CHARACTERISTICS: Age: 3 to 21 at diagnosis Performance status: Not specified Hematopoietic: ANC greater than 1,500/mm3 Platelet count greater than 100,000/mm3 Hemoglobin greater than 10 g/dL Hepatic: Bilirubin less than 1.5 mg/dL ALT less than 1.5 times normal Renal: Nuclear glomerular filtration rate or creatinine clearance greater than 70 mL/min per 1.73 square meters~PRIOR CONCURRENT THERAPY: No prior radiotherapy or chemotherapy (other than corticosteroids) No more than 31 days since definitive surgery

- Gender: ALL
- Minimum Age: 3 Years
- Maximum Age: 22 Years
- Healthy Volunteers: f

Study Arms:
- Regimen A (Type: EXPERIMENTAL): Following surgery, craniospinal irradiation followed by a boost to the primary tumor. Beginning within 1 week after initiation of radiotherapy, patients receive vincristine sulfate weekly for 8 doses. Beginning 6 weeks after the completion of radiotherapy, patients receive adjuvant lomustine/vincristine sulfate/cisplatin every 6 weeks for a total of 8 courses.
- Regimen B (Type: EXPERIMENTAL): Following surgery, craniospinal irradiation plus vincristine sulfate, followed by adjuvant cyclophosphamide/vincristine sulfate/cisplatin every 6 weeks for a total of 8 courses.

Based on this trial design, predict the completion outcome and termination type (if applicable).