Biopsy-proven NASH in diabetic patients still remaining treatment challenge, as in non-diabetic patients with NASH the use of either Vitamin E or Pioglitazone is shown to be safe & effective according to AASLD guidelines.
There is a recent paper evaluating liraglutide vs placebo in biopsy proven steatohepatitis and it also showed a decrease in fibrosis index and progression rates, so the only two pharmacologic interventions that have proven efficacy are pioglitazone and liraglutide.