Pathological analysis of bronchoscopy biopsy tissue confirmed lung adenocarcinoma….The presence of EML4-ALK gene fusion and an ALK exon 23 F1174L and S1189C mutation was identified by targeted next-generation sequencing...the patient was switched to ceritinib (150 mg, QD) for nearly 2 months. However, the chest CT assessment indicated PD after ceritinib...