Table 1. Number of articles investigating relations between microRNAs and cancer published in the last 7 years, according to keywords cited in the title or abstract.

Database	Keywords	2013	2014	2015	2016	2017	2018	2019	Total
PubMed®	“miRNA” and “cancer”	1,387	1,680	1,988	1,980	2,123	2,454	2,737	14,349
	“microRNA” and “cancer”	1,579	1,976	2,361	2,402	2,775	2,949	3,222	17,264
	“circulating microRNA” and “cancer”	24	32	33	32	35	35	49	240
	“circulating microRNA” and “cancer”	19	26	40	37	35	32	37	226
SciELO	“miRNA and “cancer”	4	2	1	4	4	4	3	22
	“microRNA and “cancer”	2	0	1	2	6	4	2	17
	“circulating microRNA” and “cancer”	0	0	1	0	0	0	0	1
	“circulating microRNA” and “cancer”	0	0	1	0	0	0	0	1