A 75-year-old woman was referred to our hospital because of a productive cough and an abnormal shadow on chest radiography. She was diagnosed as having metastatic lung adenocarcinoma harbouring ROS proto-oncogene 1 (). First-line therapy was instituted with entrectinib 600 mg daily, and a gradual decrease in serum sodium level was noticed on day 6, which deteriorated to Grade 3 hyponatremia on day 12. Despite a partial therapeutic response to entrectinib, she developed fatigue and dizziness, so the drug was withdrawn. The clinical findings and laboratory workup were compatible with a diagnosis of syndrome of inappropriate antidiuretic hormone secretion (SIADH) due to entrectinib. The hyponatremia subsequently improved and entrectinib was resumed at a reduced dose of 400 mg daily, which has been continued to date, with no recurrence of SIADH.
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| http://dx.doi.org/10.1002/rcr2.1217 | DOI Listing |
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