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Inhibition of tumorosphere formation by EGFR inhibitors. (a) The cell viability was determined by MTT assay after 72 h incubation EGFR inhibitors, gefitinib; (b,c) Concentration‐dependent inhibition of tumorosphere formation by the EGFR inhibitors, gefitinib and PD153035; (d) HCT116 forms spheres in the presence or absence of gefitinib (×40).
