What is involved?
This is a multicenter study. Patients are stratified according to measurable disease (disease measurable by standard radiographic criteria [stratum-1] vs disease evaluable only by 123I-MIBG and/or bone marrow histology [stratum-2]).
Patients receive sargramostim subcutaneously (SC [preferred]) or IV over 2 hours on days 1-2 and 8-14, hu14.18-IL2 fusion protein IV over 4 hours on days 4-6, and isotretinoin orally twice daily on days 11-24. Treatment repeats every 28 days for 4-10 courses in the absence of disease progression or unacceptable toxicity. Patients in stratum-1 who achieve stable disease (SD) after course 4 are removed from protocol therapy. Patients in stratum-2 who achieve SD after course 4 receive 2 additional courses of study treatment.
Patients may undergo blood and bone marrow sample collection periodically for correlative studies.
After completion of study therapy, patients are followed up every 3 months for 1 year, every 6 months for 2 years, and then yearly for 2 years.