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Table 1 The main features of included studies for this meta-analysis

From: Bioinformatics analysis of the expression and role of microRNA-221-3p in head and neck squamous cell carcinoma

Researcher Year Country Cancer/normal Methods Sample
TCGA 2019 USA 523/44 qPCR Tissue
GSE11163 2012 USA 16/5 qPCR Tissue
GSE103931 2018 Taiwan 30/19 qPCR Tissue
GSE107591 2018 USA 24/23 qPCR Tissue
GSE113956 2019 China 25/15 qPCR Tissue
GSE28100 2015 USA 17/3 qPCR Tissue
GSE31277 2018 Brazil 15/15 qPCR Tissue
GSE34496 2017 USA 44/25 qPCR Tissue
GSE45238 2019 USA 40/40 qPCR Tissue
GSE51829 2013 China 4/4 qPCR Tissue
GSE58911 2018 USA 15/15 qPCR Tissue
GSE69002 2017 USA 3/4 qPCR Tissue
GSE70289 2018 USA 12/4 qPCR Tissue
GSE73171 2017 Hong Kong 3/3 qPCR Tissue
GSE75630 2016 Australia 28/18 qPCR Tissue
GSE82064 2017 Switzerland 78/18 qPCR Tissue
GSE98463 2018 Spain 8/8 qPCR Tissue
Zhou Cheng. et al 2019 China 26/26 qPCR Tissue