Immunotherapy efficacy between exon 19 deletion and exon 21 L858R mutation in advanced EGFR mutant non-small-cell lung cancer: a direct and indirect meta-analysis

Zihong Chen, Lanlan Pang, Yuwen Yang, Xinyi He, Jianhua Zhan, Lin Zhang, Kangqiao Xiong, Wenfeng Fang, Li Zhang, Yaxiong Zhang