TABLE 7.

The clusters in the field of AD and ncRNAs.

ID	Cluster	Size	Silhouette	Year
0	Death	50	0.865	2016
1	Amyotrophic lateral sclerosis	45	0.855	2015
2	Alzheimer’s disease	35	0.912	2014
3	Biomarker	32	0.862	2015
4	Pathophysiology	32	0.788	2017
5	Impairment	31	0.941	2017
6	Neurodegenerative disease	30	0.872	2016
7	Amyloid precursor protein	27	0.941	2014
8	SNP	25	0.854	2016
9	Long non-coding RNA	25	0.851	2014
10	3′ untranslated region	25	0.965	2014
11	Nr4a2	24	0.876	2017
12	Synaptic plasticity	23	0.936	2017
13	Circular RNA	23	0.915	2017
14	Central nervous system	23	0.861	2013
15	Expression	21	0.918	2015
16	Long non-coding RNA	20	0.86	2017