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Cell survival test of HCC827, PC9, HCC827‐Gef and PC9‐Gef. (a) The sensitivity of HCC827 and HCC827‐Gef cells to gefitinib was examined by CCK8 assay. (
) HCC827 and (
) HCC827‐Gef. (b) The sensitivity of PC9 and PC9‐Gef cells to gefitinib was examined by CCK8 assay. (
) PC9 and (
) PC9‐Gef.
