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Background  Lung cancers with anaplastic lymphoma kinase rearrangements are highly sensitive to anaplastic lymphoma kinase tyrosine kinase inhibition, underscoring the notion that such cancers are addicted to anaplastic lymphoma kinase activity. Several anaplastic lymphoma kinase inhibitors have been identified and are being evaluated in clinical trials. However patients with poor performance status (3 or 4) were not involved in these clinical trials, it has been unclear to use anaplastic lymphoma kinase–tyrosine kinase inhibitors for these patients. Here, we report an anaplastic lymphoma kinase-positive non small cell lung cancer patient with performance status 4, who was successfully treated with alectinib.    Case presentation  We report on a 52-year-old patient diagnosed as non small cell lung cancer harboring echinoderm microtubule-associated protein-like 4-anaplastic lymphoma kinase fusion gene. His performance status was 4 because of severe respiratory failure. We treated this patient with alectinib as the first line therapy. Dramatic response was obtained and his performance status improved from 4 to 1 without severe adverse events.    Conclusion  Alectinib is a therapeutic option for the anaplastic lymphoma kinase positive patients with poor performance status.

Dramatic response to alectinib in a patient of ALK-rearranged lung cancer with poor performance status