The percentage of pts switching from 1st gen TKI in line to 3rd 2nd seems be low with 30% and it is questionable whether these data represent real world treatments. Therefore, we investigated the treatment pattern especially attrition rate between therapy EGFR mt+ pts. 965/1536 (63%) non-squamous NSCLC IV were tested for mt+. 148/965 (15%) an identified. To calculate PFS OS used Kaplan Meier lo...