Table 5.

Top 20 keywords with high frequency related to research.

Id	Keyword	Occurrences	Total link strength
1	Gastric Cancer	1,511	9,621
2	Expression	637	4,336
3	Immunotherapy	453	3,149
4	T Cell	387	2,815
5	Prognosis	368	2,575
6	Survival	285	2,129
7	Regulatory T Cell	273	2,174
8	Cell	249	1,453
9	Tumor Microenvironment	245	1,723
10	Carcinoma	230	1,752
11	Chemotherapy	218	1,588
12	Activation	157	1,122
13	Progression	148	1,109
14	Dendritic Cell	145	1,142
15	Helicobacter Pylori	141	987
16	Nivolumab	139	1,061
17	Lymphocytes	138	1,103
18	Tumor Infiltrating Lymphocytes	136	1,142
19	Cancer	134	871
20	Inflammation	129	929