- Cirrhosis or chronic hepatitis C virus positivity or chronic hepatitis B infection; subjects who may not tolerate immune-mediated hepatitis due to compromised hepatic reserve are also excluded from participation including: 1) subjects with extensive liver metastasis (as judged by the investigator) 2) subjects who drink more than two standard alcoholic beverages per day on a regular basis 3) subjects who consume more than 2 grams of acetaminophen per day on a regular basis