Table 4. Association of KRAS in the cfDNA of PDAC patients with clinicopathological criteria.

Variable	KRAS
	NoN (%)	YesN (%)	p value
Total number of PDAC patients	19	7
Site of Tumour
Head	17 (90)	2 (29)	0.015
Body, Tail, Neck	2 (10)	4 (57)
Unknown	0 (0)	1 (14)
Metastasis
No	9 (47)	1 (14)	0.190
Yes	10 (53)	6 (86)
TNM Staging
I/II	7 (37)	0 (0)	0.109
III	2 (10)	0 (0)
IV	10 (53)	6 (86)
Unknown	0 (0)	1 (14)
Ca19.9 levels (U/ml)
≤ 37	2 (10)	1 (14)	1.000
> 37	11 (58)	4 (57)
Unknown	6 (32)	2 (29)