Telomerase-related advances in hepatocellular carcinoma: A bibliometric and visual analysis

Table 5 Ranking of top 25 keywords by frequency of use

Rank	Keywords	Occurrences	Total link strength
1	Hepatocellular carcinoma	217	211
2	Expression	208	205
3	Cancer	201	197
4	Cells	95	93
5	Telomerase activity	95	95
6	Gene	78	77
7	Activation	73	73
8	Telomerase reverse-transcriptase	67	64
9	Telomerase	62	62
10	Catalytic subunit	50	50
11	Reverse-transcriptase	50	49
12	Immortal cells	48	47
13	In vitro	47	47
14	Apoptosis	43	42
15	Inhibition	42	42
16	Protein	41	41
17	C-MYC	40	39
18	Carcinoma	40	38
19	Length	40	39
20	Liver	40	40
21	Down-regulation	36	36
22	Growth	35	35
23	Hepatocellular carcinomas	35	34
24	RNA	35	35
25	In vivo	34	34