Patients with unfavorable biology receive additional chemotherapy comprising cyclophosphamide IV over 1 hour on days 84, 105, and 147; etoposide IV over 2 hours on days 84-86 and 126-128; carboplatin IV over 1 hour on days 105 and 126; and doxorubicin IV over 15-60 minutes on days 105 and 147. Patients then undergo debulking surgery on day 168 or when blood counts recover.