- No more than 9 months from the date of starting the first induction chemotherapy after diagnosis to the date of ASCT except for the rare occasions as noted below; for tandem ASCT patients, this will be the date of the FIRST stem cell infusion; Exception: for those who are initially diagnosed as non-high risk neuroblastoma, but later converted (and/ or relapsed) to high risk neuroblastoma, the 9 months restriction should start from the date of induction therapy for high risk neuroblastoma (not from the initial induction therapy for non-high risk disease), to the date of ASCT