I & II, HCMC, from October 2005 to June 2006.Results: UBT comparing to Histology and CLO - test (excluding unequivocal, n=55): Sensitivity: Pr (+|D) 100.00% - Specificity: Pr (- | ~ D): 92.30% - Positive predictive value: Pr (D|+): 93.55% - Negative predictive value: Pr (~ D| -) 100.00% - Overal accuracy: 96.45% - Positive likelihood ratio: 12.99 - Negative LR: 92.3.