PTBP2 and neuroblastoma: Interestingly, co-CM from the PTBP2 overexpression group obviously inhibited the migration of NB cells, while the PTBP2 knockingdown group showed the opposite effect (Fig. 3C), which is in accordance with our finding from NB tissues that the tumor-inhibiting effect of PTBP2 was dependent on the chemotactic activity of monocytes and Mφs in the TME.