title: A patient previously treated with ALK inhibitors for central nervous system lesions from ALK rearranged lung cancer: a case report.
abstract: BACKGROUND
  Patients with anaplastic lymphoma kinase (ALK)-rearranged non-small-cell lung cancer (NSCLC) are now preferentially treated with tyrosine kinase inhibitors (TKIs). However, patients treated with ALK inhibitors end up with acquired resistance.
  
  
  METHODS
  We present a patient with recurrent ALK-rearranged NSCLC that developed multiple brain metastases and meningitis carcinomatosa after sequential treatment with several lines of cytotoxic chemotherapy, crizotinib, and alectinib. After the patient underwent retreatment with crizotinib as salvage therapy because of poor performance status, the intracranial metastatic foci and meningeal thickening were shrank within 1 week.
  
  
  CONCLUSIONS
  Our experience with this case suggests that alectinib may restore sensitivity to crizotinib or amplified pathway such as MET which bestowed alectinib resistance was inhibited with crizotinib.
authors: Department of Thoracic Oncology and Respiratory Medicine, Tokyo Metropolitan Cancer and Infectious diseases Center Komagome Hospital.
authors: Jumpei
authors: J
authors: Kashima
authors: Department of Thoracic Oncology and Respiratory Medicine, Tokyo Metropolitan Cancer and Infectious diseases Center Komagome Hospital; Division of Oncology, Research Center for Medical Sciences, The Jikei University School of Medicine.
authors: Yusuke
authors: Y
authors: Okuma
authors: Department of Pathology, Tokyo Metropolitan Cancer and Infectious diseases Center Komagome Hospital, Tokyo, Japan.
authors: Tsunekazu
authors: T
authors: Hishima
keywords: alectinib; anaplastic lymphoma kinase rearrangement; crizotinib