EGFR and non-small cell lung carcinoma: Our analysis further showed that the cumulative incidence of SBM in stage IIIB-IV NSCLC was similar between the EGFR exon 19 deletion-positive and the L858R mutation-positive groups (39.5%, vs. 34.5%), although the former exhibited a slightly longer OS (20.6 vs. 14.2 months).