In the same way, the International Neuroblastoma Risk Group Task Force, in an effort to achieve a consensus on standard operating procedures in order to improve and standardize management of children with NB, agreed on the detection of rare neuroblasts in bone marrow, peripheral blood, and peripheral blood stem cells by immunocytochemistry using GD2 and by QRT-PCR for TH mRNA (117). Here, TH is linked to neuroblastoma.