[Effects of rh-endostar in combination with radiotherapy on rats with lung cancer].
OBJECTIVE
Radiation sensitivity is closely related to tissue oxygen, and rh-endostatin can induce the high level of oxygen content in tumor by "normalizing" tumor angiogenesis which is associated with radiotherapy sensitivity. The aim of this study is to observe the effect of combination of radiotherapy with rh-endostatin in the rats with lung cancer.


METHODS
Immediate lewis cancerous ascetic injection method was used to make rats tumors bearing model, then the rats was divided into four groups randomly: group A was treated with saline; group B was treated with rh-endostatin; group C was treated with irradiation and group D was treated with rh-endostatin and irradiation. After all rats were treated, inhibition rates and the tumor growth curve were calculated. Immunohistochemisty was adopted to check the expressions of vascular endothelial growth factor (VEGF) and microvessel density (MVD).


RESULTS
Compared with group A, the growth rates of the tumors in the other group were obviously slower, and the tumor weights were significantly different form group A (P < 0.05). Compared with the other groups, the tumor weights of group D were obviously reduced (P < 0.05). Compared with group A, VEGF and MVD of other three groups were reduced (P < 0.05), and group D were significantly cut down.


CONCLUSIONS
Combination with radiotherapy and rh-endostatin could inhibit the lung cancer significantly in rats. The possible mechanisms are to decrease the expression ofVEGF and inhibit the production of angiogenesis.
Du
He
H
Department of Medical Oncology, Remmin Hospital of Wuhan University, Wuhan 430060, China.
Ge
Wei
W
Li
Changhu
C
Zhao
Zhenyu
Z
Xu
Ximin
X
Yang
Fang
F
D000818:Animals; D018827:Carcinoma, Lewis Lung / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology / Q000532:radiotherapy*; D043169:Endostatins / Q000627:therapeutic use*; D005260:Female; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000532:radiotherapy*; D051379:Mice; D008810:Mice, Inbred C57BL; D055806:Microvessels / Q000473:pathology; D011897:Random Allocation; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism
D043169:Endostatins; D042461:Vascular Endothelial Growth Factor A