Induction therapy includes six chemotherapy drugs given in different combinations every 3 weeks for a total of 6 courses. For the past decade, induction chemotherapy has been followed by a drug called granulocyte colony stimulating factor (G-CSF, filgrastim, peg-filgrastim, Neupogen, or Neulasta) to prevent side effects from the chemotherapy. G-CSF is routinely given to patients with high risk neuroblastoma after chemotherapy to stimulate white blood cell production and shorten the time period when the absolute neutrophil count (ANC), a type of white blood cell, is low after chemotherapy. G-CSF is known to shorten the period of low ANC by approximately 3 days. When the ANC is lowest, a patient is most at risk of getting a bacterial infection.