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. 2021 May 24;22(1):556. doi: 10.3892/ol.2021.12817

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Copyright: © Yang et al.

This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Figure 1. — 827/IcoR and PC9/IcoR cells are resistant to icotinib. (A) Cell viabilities were measured using MTT in parent cells (HCC827 and PC9) and resistant cells (827/IcoR and PC9/IcoR) treated with icotinib for 24 and 48 h. (B) Colony formation was performed to test the effects of icotinib on parent cells (HCC827 and PC9) and resistant cells (827/IcoR and PC9/IcoR). *P<0.05 and **P<0.01. IcoR, icotinib-resistant.