TABLE 6.

High-frequency keywords (top 20).

Rank	Label	Occurrences
1	Pancreatic cancer	1,213
2	Gemcitabine	685
3	Chemoresistance	290
4	Pancreatic ductal adenocarcinoma	219
5	Chemotherapy	153
6	Apoptosis	139
7	Drug resistance	131
8	Gemcitabine resistance	88
9	Tumor microenvironment	82
10	Pdac	80
11	Autophagy	68
12	Cancer stem cells	68
13	Drug delivery	63
14	Immunotherapy	52
15	Prognosis	50
16	Chemosensitivity	43
17	Cancer	41
18	Pancreatic adenocarcinoma	41
19	Combination therapy	40
20	Microrna	40