Table 4. S100B and S100B autoantibodies to detect brain metastasis in patients stage I or II before brain imaging (n=46).

Test	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
S100B >0.058	100	39.5	10.3	100
S100B >0.05 + S100B <2.0	100	55.8	13.6	100

PPV, positive predictive value; NPV, negative predictive value.