<qa>  What is the option 2 of the treatment?- Option 2: Patients receive carboplatin IV over 1 hour on day 1, etoposide phosphate IV over 1 hour on days 1-3 and 22-24, and ifosfamide IV over 3 hours on days 22-26. Treatment repeats every 6 weeks for 2 courses. After recovery from chemotherapy, patients undergo radiotherapy 5 days a week for 5 weeks. 