- Alpha-fetoprotein value within normal limits obtained within one year prior to entry. Results above the upper limit of normal but <=50 ng/mL require both of the following: Alpha-fetoprotein value <=50 ng/mL obtained within 3 months prior to entry in the study and Ultrasound obtained within 3 months prior to entry in the study or that is negative for evidence of hepatocellular carcinoma.