Primary resistance to afatinib in a patient with NSCLC harboring EGFR p.E709_T710delinsD and brain metastases: a case report and literature review
EGFR p.E709_T710delinsD is a rare in-frame deletion-insertion P-loop and alpha-C-helix compressing (PACC) mutation of EGFR exon 18. Current evidence suggests that patients with non-small cell lung cancer (NSCLC) harboring this variant generally respond to afatinib. However, primary resistance to afatinib in this m...