The human colorectal cancer cell lines HCT116 and SW480 (Obtained from Zhong Qiao Xin Zhou Biotechnology Co., Ltd., China) were cultured in DMEM (Gibco BRL, Grand Island, NY) complete medium containing 10%, FBS and 1% penicillin/streptomycin (Zhong Qiao Xin Zhou Biotechnology Co., Ltd., China) and incubated in an incubator containing 37 °C and 5% CO2. Fresh medium was exchanged every 2 days, and when the cell density reached 80–90%, the cells were digested with trypsin solution for subculture or plate laying. HO-3867 (10 µmol/l, MedChemExpress LLC, China) is a STAT3 inhibitor used to inhibit the expression of STAT3 [32 (link)].
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