There is a study that showed that in RA vs PsA males, RA males drank more alcohol than PsA males, and PsA males suffered more liver toxicity - suggesting that susceptibility to MTX/Alcohol related liver toxicity has a genetic predisposition!
However, Weary, there is one important line in this quite reasonable study which is worth reading:
"Alcohol consumption did not correlate with hepatic injury (mean 5.15 vs 6.6 alcohol units/week consumed by RA and PsA patients, respectively)."
If you want to read it, google the following: (Forum rules says linking to a study is against the rules)
"Methotrexate and Hepatic Toxicity in Arthritis"
Clin Drug Invest. 2006;26(2):55-62. © 2006 Adis Data Information BV
Lindsey Tilling, Sue Townsend and Joel David, Department of Rheumatology, Royal Berkshire and Battle Hospitals NHS Trust, Reading, UK
EDIT: I should point out that the study was focusing on Hepatic toxicity in general and not on Alcohol consumption, they randomly selected people from their study and investigated consumption vs toxicity in them - there could've been an inherent bias in the selection mechanism, or more likely, their criteria for "hepatic toxicity" may have been insufficient. It is based on having elevated transaminase levels on at least 2 occasions - which may or may not be a sufficient test of liver damage due to alcohol and MTX, but they can't exactly liver biopsy
Other sources of bias is the sample size, 550 for RA vs 69 people for PsA - RA patients are going to regress to the mean, and there's a lot more room for variance/fluctuation of data within the PsA group, so anything suggestive in differences correlating between RA and PsA need to be taken with a pinch of salt...
Post Edited (JayBespoke) : 9/2/2010 1:36:38 AM (GMT-6)