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Expression of HIF-1α, CXCR4, and VEGF in normal colonic tissue and hyperplastic polyps (HPP). HIF-1α, CXCR4, and VEGF staining was negative in normal colonic tissue and HPP. Negative immunohistochemical staining of normal colonic tissue in (a) (HIF-1α), (c) (CXCR4), (e) (VEGF), respectively (×100). Negative immunohistochemical staining of HPP in (b) (HIF-1α), (d) (CXCR4), (f) (VEGF), respectively, (×100).
