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The Livmarli Resubmission Journey: From FDA CRL to Approval 

Categories: Cell Therapy
From molecule, to marketplace

Hello Regulatory Scientists, 

Today, let’s explore the journey of Livmarli (maralixibat) from receiving an FDA Complete Response Letter (CRL) to achieving approval. This case study provides valuable insights and lessons that can guide companies developing new drugs today. 

Regulatory History and Initial Submission 

Drug: Livmarli (maralixibat) 
Mechanism of Action: Apical sodium-dependent bile acid transporter (ASBT) inhibitor, which reduces bile acid reabsorption and helps alleviate symptoms of cholestatic liver diseases 
Indication: Treatment of cholestatic pruritus in patients with Alagille syndrome 
Initial Submission Date: May 2020 

The Complete Response Letter (CRL) 

CRL Date: November 2020 
CRL Concerns: 

  1. Efficacy Data: The FDA requested additional efficacy data to support the clinical benefit of Livmarli, particularly focusing on long-term outcomes. 
  1. Safety Data: Concerns were raised about the safety profile, including potential adverse effects that required further investigation. 
  1. Manufacturing Process: The FDA noted issues related to the quality and consistency of the drug’s manufacturing process. 

Resubmission Strategy 

Mirum Pharmaceuticals, the company behind Livmarli, implemented a comprehensive strategy to address the FDA’s concerns: 

  1. Additional Clinical Trials: Conducted further studies to gather more robust data on the efficacy and safety of Livmarli, focusing on long-term outcomes and potential adverse effects. 
  1. Enhanced Safety Monitoring: Provided additional data and analyses on the safety profile, including long-term safety data and management strategies for potential adverse effects. 
  1. Manufacturing Process Improvements: Made significant enhancements to the manufacturing process to ensure consistency and quality. 
  1. Continuous FDA Engagement: Maintained open lines of communication with the FDA to ensure alignment on the resubmission strategy and clarify any outstanding questions. 

Resubmission Date: April 2021 

Outcome 

Approval Date: September 2021 
Livmarli was approved for the treatment of cholestatic pruritus in patients with Alagille syndrome, providing a new therapeutic option for this rare and debilitating condition. 

Lessons Learned 

The journey of Livmarli from CRL to approval highlights several key lessons for drug developers: 

  1. Comprehensive Data Collection: Providing extensive clinical data, particularly long-term efficacy and safety data, is crucial to addressing FDA concerns. 
  1. Enhanced Safety Monitoring: Ensuring thorough understanding and management of the drug’s safety profile can help mitigate regulatory concerns. 
  1. Manufacturing Process Improvements: Ensuring the quality and consistency of the manufacturing process is vital for regulatory approval. 
  1. Continuous FDA Engagement: Maintaining open and ongoing communication with the FDA helps align development efforts with regulatory expectations. 
  1. Proactive Quality Control: Implementing stringent quality control measures ensures the consistency and reliability of the drug’s production. 

Relevance for Current Drug Developers 

For companies developing drugs today, the Livmarli case underscores the importance of strategic planning and meticulous attention to detail in the regulatory process. Here are some takeaways to help avoid a CRL and achieve first-cycle approval: 

  1. Thorough Pre-Submission Preparation: Ensure that all aspects of your submission, including clinical data, safety data, and manufacturing processes, meet FDA standards. 
  1. Proactive Risk Management: Identify and address potential risks early in the development process to prevent issues from arising during FDA review. 
  1. Engage with the FDA Early and Often: Regular interactions with the FDA can provide valuable guidance and help steer the development process. 
  1. Invest in Quality Data: Prioritize the collection of high-quality, detailed safety and efficacy data to support the submission. 
  1. Utilize Advisory Committees: Seek feedback from advisory committees to validate data and address potential concerns, even if formal hearings are not required. 

By learning from the Livmarli resubmission experience, current drug developers can better navigate the regulatory landscape, avoid common pitfalls, and increase the likelihood of a successful first review cycle approval. 

Stay diligent and strategic.

CERES Regulatory Services 

Picture of Asad Khan
Asad Khan