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The Evrysdi Resubmission Journey: From FDA CRL to Approval 

Categories: Clinical Studies / Regulatory Rescue
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Hello Regulatory Scientists, 

Today, let’s explore the journey of Evrysdi (risdiplam) 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: Evrysdi (risdiplam) 
Mechanism of Action: Survival of motor neuron 2 (SMN2) splicing modifier, which increases the production of functional SMN protein 
Indication: Treatment of spinal muscular atrophy (SMA) in patients aged 2 months and older 
Initial Submission Date: December 2019 

The Complete Response Letter (CRL) 

CRL Date: April 2020 
CRL Concerns: 

  1. Manufacturing Issues: The FDA raised concerns about the quality and consistency of the drug’s manufacturing process. 
  1. Clinical Data: Request for more detailed analyses of clinical trial data to support the drug’s efficacy and safety. 
  1. Risk Management Plan: Need for a detailed risk management plan to monitor and mitigate potential adverse effects. 

Resubmission Strategy 

Roche, the company behind Evrysdi, implemented a comprehensive strategy to address the FDA’s concerns: 

  1. Manufacturing Process Improvements: Made significant enhancements to the manufacturing process to ensure consistency and quality. 
  1. Enhanced Quality Control Measures: Established stricter quality control measures to address any potential issues with the manufacturing process. 
  1. Additional Clinical Data: Conducted further analyses of existing clinical data and provided more detailed information to support the drug’s efficacy and safety. 
  1. Risk Management Plan: Developed a robust risk management plan, including monitoring guidelines and patient education materials. 
  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: June 2020 

Outcome 

Approval Date: August 2020 
Evrysdi was approved for the treatment of spinal muscular atrophy in patients aged 2 months and older, providing a new, at-home treatment option for this debilitating disease. 

Lessons Learned 

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

  1. Manufacturing Process Improvements: Ensuring the quality and consistency of the manufacturing process is crucial. Proactive improvements and rigorous quality control measures can prevent setbacks. 
  1. Comprehensive Data Analysis: Providing detailed analyses of clinical trial data to support the drug’s efficacy and safety is essential to addressing FDA concerns. 
  1. Effective Risk Management: Developing and implementing a detailed risk management plan can help mitigate potential adverse effects and ensure patient safety. 
  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 Evrysdi 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 manufacturing processes and clinical data, 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 Evrysdi 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