The process is referred to the previous study [18 (link)]. Briefly, NSCLC cells were maintained in DMEM-F12 medium containing B27 (Sigma, 20 ng/ml) and EGF (BD Biosciences, San Jose, CA, 10 ng/ml) in non-adherent 24-well plates (Corning, NY) at 1000 cells/well for 10 days. After then, spheroids with more than 50 μm were photographed and counted. For analysis on spheroids, spheroids were collected, trypsinized and re-seeded in plates. The spheroid-derived cells were incubated until the end of each experiment, and fresh spheroids were collected for each experiments.
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