Similar results were obtained when using a non-endothelial cell type (SHEP neuroblastoma cell line) whereby knock-down of ADRB1 and ADRB2 alone or in combination did not affect the ability of propranolol to block the proliferative response and its ability to enhance response to chemo-therapies (Figure 1—figure supplement 1C and 1D). This evidence concerns the gene ADRB1 and neuroblastoma.