CD34 and glioblastoma: In glioblastoma tissues, we detected a median of 1813 Lin-CD34+ HSPCs per million cells analyzed (range n = 525–8882); In lower grade glioma samples, 1617 HSPCs per million (n = 47–2707) in the metastatic sample we observed 296 HSPCs per million, compared to 7933 HSPCs per million derived from a healthy donor bone marrow sample (Fig. 3d).