2. Materials and Methods
2.1 Search methods
From July 2009 to February 2019, related studies were found by searching the databases of EMBASE, PubMed, Web of Science, MEDLINE, and Cochrane library database, meanwhile, we also consulted some Chinese periodicals, such as China Academic Journals (CNKI), Wanfang and Weipu. The key words are as follows: (a) Disorder: Non-small cell lung cancer and related terms; (b) Intervention: traditional Chinese medicine, Chinese herbal medicine and related terms; (c) Study type: randomized controlled trial and related terms. The experimental and control groups included in this analysis were the intervention and EGFR-TKIs groups, respectively. All NSCLC cases were confirmed by histopathological examination. Two independent reviewers independently searched the literature and extracted the data.