Novel Pharmacotherapy Options for NASH

Abstract

While simple to recommend, diet and lifestyle measures as a first-line therapy for nonalcoholic steatohepatitis (NASH) are hardly a model of successful therapy, as most clinicians can testify. They can be complex to implement, hard to sustain, and of limited efficacy in advanced stages of the disease. The need for specific pharmacotherapy is now acknowledged by practitioners, the pharmaceutical industry, and regulators and is largely expected by patients. The result is a clear move away from products developed second hand for NASH (such as pioglitazone or metformin) or from generic, non-specific hepatoprotectors (such as pentoxifylline, ursodeoxycholic acid, or antioxidants) toward molecules developed and tested specifically for NASH that aim to correct one or several of the pathways of liver injury in this disease. The two most advanced molecules, obeticholic acid and elafibranor, have shown encouraging data on improving hepatic histology. Both compounds appear to clear NASH, with obeticholic acid improving liver fibrosis and elafibranor improving the glycemic and lipid profile. Much larger trials, currently ongoing, will need to confirm these preliminary data and better characterize the safety and tolerability profile. Meanwhile, other compounds are being tested, a few in phase 2b studies (cenicriviroc, aramchol for NASH, and simtuzumab for NASH fibrosis) and many more in earlier, smaller trials. Most of these drug candidates target different pathways, which speaks to the diversity and dynamism of the NASH pipeline.

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