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In order to investigate the antitumor effect and molecular mechanism of interferon-α(IFN-α) on human acute myeloid leukemia cell line U937 cells in vitro, the proliferation of U937 cells was determined by MTT assay, the apoptosis rate was analyzed by flow cytometry (FCM), and the mRNA expression of cell cycle regulatory protein cyclin E was detected by RT-PCR. The results showed that IFN-α could inhibit the proliferation of U937 cells significantly in a dose- and time-dependent way (P