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Non-synonymous mutations in NSCLC from our cohorts. The median non-synonymous mutations of EGFR L858R (n=421) was three, of EGFR 19del (n=367) was three, of EGFR other (n=145) was four and of EGFR WT (n=604) was five. **p < 0.01; ***p < 0.001; ****p < 0.0001 , ns, no significance.
