The Cell Counting Kit-8 (CCK-8) assay (MedChemExpress) was used according to the protocol provided by the manufacturer to assess cell proliferation. ASPC-1 and SW1990 cells were seeded into 96-well plates (5 × 103 cells/plate) and cultured at 37 °C. Ten microlitres of CCK-8 solution was added to each well of the plate at the following times: 0 h, 24 h, 48 h, 72 h and 96 h. Optical density (OD) was measured at 1–4 days at a wavelength of 450 nm using a Multiskan FC microplate reader (Thermo Fisher Scientific, Inc.).
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