Alternating Administration of Osimertinib for Leptomeningitis and Docetaxel Plus Ramucirumab for Lung Adenocarcinoma Resistant to Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors.

Traditionally, leptomeningitis (LM) has been considered untreatable and terminal, but the development of epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) has significantly improved the prognosis of patients with EGFR mutations. However, non-LM lesions occasionally progress or recur, even when the LM is successfully controlled with EGFR-TKIs, and treatment of such cases remains unclear. We herein report a patient with advanced non-small-cell lung cancer (NSCLC) who was treated with an EGFR-TKI for LM and cytotoxic chemotherapy for EGFR-TKI-resistant pulmonary lesions. The patient survived for almost four years after the diagnosis of LM, suggesting that this treatment may be beneficial in advanced NSCLC with EGFR-TKI-sensitive LM and EGFR-TKI-resistant extracranial lesions.