PECAM1 and neuroblastoma: To investigate such new therapeutic targets, we have objectively quantified Ret F, Col I F, GAGs (Gomori, Masson’s trichrome, and Alcian blue pH 2.5 HC, respectively), blood vessels (CD31 IHC, Dako), lymph vessels (D2-40 IHC, Dako), and cell markers, including leukocyte lineage (CD45/LC IHC, Dako) and NB cells, in primary NB.