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Objective To establish a direct reverse transcription real-time fluorescence quantitative polymerase chain reaction (RT-qPCR-D)method for detecting serum circulating Bmi-1 mRNA,and analyze the levels of serum circulating Bmi-1 mRNA in colorectal cancer patients using this method for exploring its diagnosis value in colorectal cancer.Method RNA was extracted from colorectal cancer HT29 cell line,and detection standard curves of Bmi-1,GAPDH,EEF1A1 mRNAs were established,then the amplification efficiencies were calculated.