Prospective Study on Resistance-associated Mutations in Metastatic Lung Cancer

Blood withdrawal for each patient is performed (i) at the time of treatment initiation with tyrosine kinase inhibitors (TKI); (ii) at the time of the first planned instrumental re-evaluation according to clinical practice regardless of the type of response to the TKI employed (9-12 weeks); (iii) at the time of radiological progression according to RECIST 1 criteria. 1 at computerized tomography scan with contrast or metabolic progression at 18F-2-fluoro-2-deoxy-D-glucose fluorodeoxyglucose during TKI therapy; (iv) at the time of the change of therapeutic strategy decided by the investigator when used beyond progression and not coinciding with point iii. The ctDNA is extracted from plasma and analyzed with Illumina sequencing method.