YH25448 less suppresses WT EGFR than osimertinib in vivo.

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YH25448 less suppresses WT EGFR than osimertinib in vivo. YH25448 less suppresses WT EGFR than osimertinib in vivo. A, Skin problems of BALB/c nude mice-treated with vehicle, YH25448 (50 and 75 mg/kg), or osimertinib (50 and 75 mg/kg). B and C, Representative photographs of 75 mg/kg YH25448 or osimertinib-treated BALB/c nude mice after 12 days. Photos taken from separate experiment to D–G, but study design was very similar. D and E, Immunohistochemical analysis of mouse skin for p-EGFR, EGFR, F4/80 and H&E staining results. Representative images are presented. F and G, Histogram of staining intensity for implying the infiltrated cells in epidermis and hair follicles and epidermal thickness based on H&E staining images. Measurements were taken from five images for each group, and results are presented as mean ± SD. ***, P < 0.0001; **, P < 0.00001. Jiyeon Yun et al. Clin Cancer Res 2019;25:2575-2587 ©2019 by American Association for Cancer Research