[EGFR-TKI response predictive marker]This MALDI MS algorithm was not merely prognostic but could classify NSCLC patients for good or pooroutcomes after treatment with EGFR TKIs. This algorithm may thus assist in the pretreatment selection ofappropriate subgroups of NSCLC patients for treatment with EGFR TKIs. Here, EGFR is linked to non-small cell lung carcinoma.