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Expression of HIF1α, VEGFR1, and VEGFR2 in different stages of tumor growth in comparison to normal healthy groups. Tumor volume of <100 mm3 is in early- stage, 100-300 mm3 is in the intermediate stage, 300-500 mm3 is in the advanced stage and 500-1000 mm3 is in end-stage. (*P < 0.05, **P < 0.01, ***P < 0.001).
