As far as the alcohol and hep c goes:
"An Italian survey showed that alcohol intake doubles the risk of hepatocellular
carcinoma in HCV-infected patients who drink 41 to 80 g of alcohol per day
(between 3.4 and 6.7 drinks) and quadruples the risk for patients who drink more
than 80 g of alcohol per day."
It is from an article by the National Institute of Health
Here is another good quote on the subject:
"Patients infected with the hepatitis C virus (HCV) who drink heavily are likely
to suffer more severe liver injury, promoting disease progression to cirrhosis
and increasing their risk for liver cancer. Some research, although not
conclusive, suggests that even MODERATE DRINKING may spur liver damage in
HCVinfected patients. "
It is from an article on Hepatitis C and Alcohol by the NIAAA