A recent study of non-small cell lung cancer found that those with epidermal growth factor receptor (EGFR)-positive disease were at an increased likelihood of developing leptomeningeal metastases (LM), but that a certain treatment type could help to prolong survival. What was that treatment?
A. Programmed death-ligand inhibitor
B. Chemotherapy
C. Cytotoxic T-lymphocyte-associated antigen 4 inhibitor
D. Tyrosine-kinase inhibitor
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