Fig. 4From: Frequency of the acquired resistant mutation T790 M in non-small cell lung cancer patients with active exon 19Del and exon 21 L858R: a systematic review and meta-analysisMeta-analysis about positive ratio of acquired T790 M mutation in patients withexon19 deletion and L858R point mutation. (One study [18] cannot be included due to not providing the type of mutation with initial biopsy)Back to article page