donate now The Fatty Liver Foundation


The development of Pegozafermin by 89Bio represents a significant advancement in the treatment of Nonalcoholic Steatohepatitis (NASH), a liver disease characterized by inflammation and fibrosis due to fat accumulation. This paper delves into the clinical progress, regulatory milestones, and the implications of Pegozafermin's development, supported by recent studies and announcements.

**Introduction to Pegozafermin**

Pegozafermin is an investigational long-acting glycopegylated fibroblast growth factor 21 (FGF21) analogue. It targets the treatment of NASH and severe hypertriglyceridemia (SHTG) by mimicking the activity of endogenous FGF21, thereby regulating metabolism, energy balance, and insulin sensitivity. This therapeutic approach aims to address the multifaceted nature of NASH, offering potential benefits in lipid metabolism, liver health, and insulin sensitivity [1].

**Clinical Development and Trials**

The journey of Pegozafermin through clinical development has been marked by promising results in early and mid-stage trials. A noteworthy achievement was its performance in a randomized, controlled trial that demonstrated significant improvements in liver fat content, liver fibrosis, and biomarkers of liver injury among NASH patients. These findings underscore the potential of Pegozafermin as a meaningful therapeutic option for individuals battling NASH [1].

**Regulatory Milestones**

A pivotal moment in the development of Pegozafermin was its designation as a Breakthrough Therapy by the U.S. Food and Drug Administration (FDA) for the treatment of NASH with fibrosis. This designation is supported by positive data from the ENLIVEN Phase 2b trial, which evaluated Pegozafermin in patients with F2/F3 and F4 stages of NASH. The Breakthrough Therapy Designation underscores the FDA's recognition of Pegozafermin's potential to offer substantial improvement over existing therapies for serious or life-threatening diseases [4].

**Implications for NASH Treatment**

The advancement of Pegozafermin into late-stage development is a testament to its potential in addressing the unmet medical needs of patients with NASH. The drug's progression is supported by 89Bio's comprehensive clinical development strategy, aimed at evaluating its efficacy and safety in a broader patient population. The company's efforts to bring Pegozafermin to market include ongoing discussions with regulatory agencies to finalize the design of a Phase 3 development program, expected to commence in the first half of 2024 [3].


The development of Pegozafermin by 89Bio marks a significant milestone in the quest for effective treatments for NASH. Through its innovative mechanism of action and promising clinical trial results, Pegozafermin has the potential to change the treatment landscape for patients with this challenging liver disease. As 89Bio continues to navigate through regulatory pathways and clinical trials, the healthcare community eagerly anticipates further updates on Pegozafermin's journey towards approval and clinical application.

For more detailed information about Pegozafermin and its development journey, please refer to the following sources:

- [Randomized, Controlled Trial of the FGF21 Analogue Pegozafermin in NASH]( [1]
- [89Bio Pipeline Overview]( [2]
- [89bio Reports Third Quarter 2023 Financial Results and Provides Corporate Updates]( [3]
- [89bio Announces U.S. FDA has Granted Breakthrough Therapy Designation for Pegozafermin in Nonalcoholic Steatohepatitis (NASH)]( [4]

Click for our online community