Abstract
Bevacizumab (BV), a monoclonal antibody against vascular endothelial growth factor (VEGF), is currently used in the treatment of malignant glioma. To understand mechanisms of resistance to BV, we investigated morphological changes in tumor vessels and expression of angiogenic factors, such as VEGF, Flt-1, basic fibroblast growth factor (bFGF), and platelet-derived growth factor-BB (PDGF-BB), in four autopsied tumors after BV treatment. Three patients had glioblastomas; the fourth had a secondary glioblastoma that developed from a diffuse astrocytoma. BV was administered because of recurrence following the use of the Stupp regimen in these four patients. We compared the initial surgical specimen with that obtained after death following BV treatment. Immunohistochemical staining of the autopsied tumors showed that Flt-1 expression increased while VEGF expression was significantly reduced. Additionally, other angiogenic factors, particularly bFGF, were enhanced. Interestingly, the proliferation of endothelial cells was reduced, but remarkable proliferation of pericytes was observed. These results suggest that following BV treatment, glioblastomas can grow tumor vessels by expressing various angiogenic factors. These mechanisms might be important for rapid regrowth and blood brain barrier repair after BV treatment. Inhibition of multiple angiogenic factors will be required to control tumor vessels in glioblastoma.
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We thank Yoichiro Kato, Hideyuki Takeiri, Noriko Sakayori, and Takashi Sakayori for their help with immunohistochemistry and their scientific suggestions.
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10014_2016_248_MOESM1_ESM.pdf
Hematoxylin and eosin, alpha-smooth muscle actin (αSMA), and CD31 immunohistochemical staining of the surgical and autopsied samples (scale bar, 50 µm) in Case2 and Case4. (PDF 290 kb)
10014_2016_248_MOESM2_ESM.pdf
Staining for vascular endothelial growth factor A (VEGF-A), Flt-1, basic fibroblast growth factor (bFGF), and platelet-derived growth factor-BB (PDGF-BB) Scale bar, 100 µm. Compared with the surgical samples, the expression of bFGF (I–L) were especially highly expressed in the autopsied samples (PDF 388 kb)
10014_2016_248_MOESM3_ESM.pdf
Hematoxylin and eosin, alpha-smooth muscle actin (αSMA), and CD31 immunohistochemical staining of the surgical and autopsied samples (scale bar, 50 µm) in case without BV treatment. Proliferation of pericytes around the vessels was not observed, in difference with tumor specimens obtained after Bevacizumab administration. (PDF 283 kb)
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Okamoto, S., Nitta, M., Maruyama, T. et al. Bevacizumab changes vascular structure and modulates the expression of angiogenic factors in recurrent malignant gliomas. Brain Tumor Pathol 33, 129–136 (2016). https://doi.org/10.1007/s10014-016-0248-6
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DOI: https://doi.org/10.1007/s10014-016-0248-6