Table 3. Risk score analysis of in hepatocellular carcinoma (HCC) metastasis and non-metastasis patients' plasma samples.

Score	0–3.214	3.214–6.428	PPVa	NPVb
Training set			0.94	0.86
Non-Metastasis	19	1
Metastasis	3	17
Validation set			0.91	0.90
Non-metastasis	71	7
Metastasis	8	71

^aPPV, positive predictive value.

^bNPV, negative predictive value.