Table 4.

Top 20 keywords related to CAR-NK cells.

Rank	Keyword	Count	Rank	Keyword	Count
1	natural killer cells	735	11	solid tumors	117
2	immunotherapy	574	12	in-vivo	110
3	chimeric antigen receptor	504	13	cytotoxicity	108
4	cancer	178	14	activation	107
5	car-t cells	143	15	dendritic cells	96
6	acute myeloid-leukemia	141	16	tme	78
7	nk-92 cells	138	17	multiple myeloma	77
8	expression	132	18	regulatory t-cells	72
9	antitumor-activity	125	19	stem-cells	70
10	phase-i	123	20	monoclonal-antibodies	67