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Osimertinib mesylate tablets are an imported drug, usually produced by foreign pharmaceutical companies. This drug has been approved in some countries and is used to treat advanced non-small cell lung cancer (NSCLC) that is positive for EGFR (epidermal growth factor receptor) gene mutations. Due to its remarkable and proven efficacy, osimertinib mesylate tablets are widely used in the treatment of lung cancer worldwide. In some countries it may be used as a first-line treatment option. However, before using this medication, patients should consult their physician for appropriate advice and use it under their physician's guidance.