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HIF-2α, ABCG2 and Oct-4 mRNA expression in tumor tissues of each group detected by reverse transcription polymerase chain reaction. Lane A, control group; lane B, 5-Fu group; lane C, celecoxib group; lane D, combination group. HIF-2α, hypoxia-inducible factor-2α; Oct-4, octamer-binding transcription factor 4; 5-Fu, 5-fluorouracil.
