Gastric cancer cell lines and PDCs were detached using TrypLE-Express and seeded into 3D culture media consisting of DMEM/F12 supplemented with 10 mM HEPES, 1% antibiotic-antimycotic solution, B27, N2, 1% Glutamax (Gibco), 1 mM N-acetyl-L-cysteine (Sigma Aldrich), 10 μg/mL insulin, 20 ng/mL basic fibroblast growth factor, and 50 ng/mL epidermal growth factor (Peprotech). After 4 days, the cells were dissociated into single cells using Accutase (Gibco) and mixed with 0.75% (w/w) alginate for loading onto the micropillar chip.
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