Patients receive topotecan hydrochloride IV over 30 minutes on days 1-5 and vincristine IV continuously and doxorubicin hydrochloride IV continuously over 48 hours on days 5 and 6. Patients also receive filgrastim (G-CSF) subcutaneously beginning on day 9 and continuing until blood counts recover. Treatment repeats every 21-28 days for 2 courses in the absence of disease progression or unacceptable toxicity. Patients who achieve partial response (PR) after two courses of treatment receive an additional two courses. Patients who achieve complete response or very good PR are treated according to the standard therapy in protocol SIOP-EUROPE- HR-NBL-1. Patients who fail to achieve PR after 2 courses receive further treatment at the physician's discretion.