They found that tumors with the densest system of tiny blood essels contained the greatest number of Nestin+ cells, and that Nestin+ cells are located next to blood essels in brain tumors.

• 所以我们的研究可以解释为什么浸润性的肿瘤总是产生很多血管，为什么脑肿瘤在治疗后会复发".