Objective: Early finding of hepatocellular carcinoma(HCC) and monitoring of its metastasis are of the utmost importance. The objectives of this study were to investigate the values of circulating hepatoma-specific gamma-glutamyl transferase(HS-GGT) fraction and α-fetoprotein mRNA(AFP-mRNA) from peripheral blood mononuclear cells(PBMCs) in diagnosis or monitoring metastasis of HCC. Methods: Total RNA was extracted from hepatomas or PBMCs of patients, synthesized to AFP-cDNA through random primers and reverse transcriptase, amplified by using a nested PCR assay, and confirmed by sequencing. Simultaneity, the HS-GGT activities were quantitatively determined in sera of patients. The comprehensive assessments of two markers were investigated in HCC patients. Results: The amplified fragments of AFP-mRNA were identical to original designed ones(159 bp) and confirmed by sequencing. The lowest sensitivity was 2 ng/L of total RNA. The incidences of AFP-mRNA and HS-GGT were 60.4%(113 of 187) and 84.5%(158 of 187) in the HCC group, and their significantly higher(P < 0.01) than that in any of other groups. The high frequencies of HS-GGT and AFP-mRNA were 78.2% and 56.4% in the HCC patients with AFP < 50 ng/mL. All positive of AFP-mRNA was found in HCC patients with extrahepatic metastasis. No significant correlation was found between tumor size and AFP-mRNA or HS-GGT. The total incidence of combined AFP-mRNA and HS-GGT detection was 93.6 % for HCC diagnosis. Conclusion: HS-GGT and AFP-mRNA are specific markers for HCC diagnosis or differentiation, especially the former for early finding and the later for monitoring metastasis of HCC. Objective: Early finding of hepatocellular carcinoma (HCC) and monitoring of its metastasis are of the utmost importance. The objectives of this study were to investigate the values ​​of circulating hepatoma-specific gamma-glutamyl transferase (HS-GGT) fraction and α-fetoprotein Methods: Total RNA was extracted from hepatomas or PBMCs of patients, synthesized to AFP-cDNA through random primers and reverse transcriptase, amplified by using (AFP-mRNA) from peripheral blood mononuclear cells (PBMCs) in diagnosis or monitoring metastasis of HCC. a nested PCR assay, and confirmed by sequencing. Simultaneity, the HS-GGT activities were quantitatively determined in sera of patients. The comprehensive assessments of two markers were investigated in HCC patients. Results: The amplified fragments of AFP-mRNA were identical to original The createds (159 bp) and confirmed by sequencing. The lowest sensitivity was 2 ng / L of total RNA. The incidences of AFP-mRNA and HS-GGT were 60.4% (113 of 187) and 84.5% (158 of 187) in the HCC group, and their significantly higher (P <0.01) than that in any of the other groups. The high frequencies of HS-GGT and AFP- mRNA were 78.2% and 56.4% in the HCC patients with AFP <50 ng / mL. All positive of AFP-mRNA was found in HCC patients with extrahepatic metastasis. No significant correlation was found between tumor size and AFP-mRNA or HS-GGT. The total incidence of combined AFP-mRNA and HS GGT detection was 93.6% for HCC diagnosis. Conclusion: HS-GGT and AFP-mRNA are specific markers for HCC diagnosis or differentiation, especially the former for early finding and the later for monitoring metastasis of HCC.