Iressa approved by US FDA for first-line treatment of patients with advanced EGFR mutation-positive non-small cell lung cancer
13 July 2015 AstraZeneca today announced that the US Food and Drug Administration (FDA) has approved IRESSA (gefitinib) tablets, 250mg once daily, for the first-line treatment of patients with metastatic non-small cell lung cancer (NSCLC) whose tumours have epidermal growth factor receptor (EGFR) exon 19 deletions or exon 21 (L858R) substitution mutations, as detected by an FDA-approved test. IRESSA is an oral, EGFR tyrosine kinase inhibitor (TKI), which works by blocking the activity of the EGFR tyrosine kinase enzyme responsible for regulating signalling pathways implicated in the