TABLE 8.

The top 10 frequency and centrality of keywords related to natural products in cancer research.

Rank	Keyword	Counts	Rank	Keyword	Centrality
1	Apoptosis	6,238	1	Apoptosis	0.35
2	Cancer	6,057	2	Expression	0.33
3	Natural product	4,565	3	Natural product	0.26
4	In vitro	4,041	4	In vitro	0.24
5	Expression	3,777	5	Cancer	0.16
6	Activation	2,868	6	Breast cancer	0.14
7	Cytotoxicity	2,351	7	NF kappa B	0.14
8	Breast cancer	2,146	8	Antioxidant	0.14
9	NF kappa B	2,130	9	Down regulation	0.13
10	Cell	2,123	10	Flavonoid	0.12