EGFR and cancer: Previous studies showed that EGFR-mutated NSCLC cell lines show much more robust responsiveness to first-generation EGFR-TKIs in 3D culture (monoculture cancer cell line spheroids or monoculture or mixed culture organoids in ECM/Matrigel) compared to 2D adherent culture, and further that 3D conditions more readily mirror EGFR-TKI responses seen in vivo (Jacobi et al., 2017).