The Survival Effect of Metformin on Non-Small Cell Lung Cancer Treated with Chemotherapy: A Systematic Review

Table 1

Search strategies of each database.

Databases	Search strategies
PubMed	(“Lung Neoplasms”(Mesh)) and (“Metformin”(Mesh) OR Glucophage OR Glumetza OR Fortamet OR Riomet OR Metformine OR Metformina OR Dimethylguanylguanidine) and ((“Chemotherapy, Adjuvant”(Mesh)) OR (“Drug Therapy”(Mesh))
Embase	1: Lung cancer OR Lung Neoplasms
	2: Metformin OR Glucophage OR Glumetza OR Fortamet OR Riomet OR Metformine OR Metformina OR Dimethylguanylguanidine
	3: Drug Therapy OR Chemotherapy OR Chemotherapy
	1 and 2 and 3
Web of Science	TS = ((Lung Neoplasms) AND (Metformin OR Glucophage OR Glumetza OR Fortamet OR Riomet OR Metformine OR Metformina OR Dimethylguanylguanidine) and (Chemotherapy OR Drug Therapy))