Assyro AI
US FDAUnited StatesCRLComplete Response Letter

Complete Response Letter NDA 505b1 217379 (Jun 14, 2024)

Issued June 14, 2024

Issued

June 14, 2024

Application

NDA 505b1 • 217379

Review center

CDER

Stage

Final Decision

Letter type

Complete Response Letter

Response due June 14, 2025Requires resubmission addressing deficiencies.

Summary

This document outlines the requirements for submitting a safety update as part of a New Drug Application (NDA) response, detailing specific data presentation and analysis expectations for nonclinical and clinical studies.

Key points

  • Include a safety update as described at 21 CFR 314.50(d)(5)(vi)(b).
  • The safety update must include data from all nonclinical and clinical studies/trials of the drug under consideration, regardless of indication, dosage form, or dose level.
  • Describe in detail any significant changes or findings in the safety profile.
  • Incorporate new safety data when assembling sections describing discontinuations due to adverse events, serious adverse events, and common adverse events.
  • Present new safety data from studies/clinical trials for the proposed indication using the same format as in the original submission.
  • Present tabulations of the new safety data combined with the original application data.
  • Include tables that compare frequencies of adverse events in the original application with the retabulated frequencies.
  • For indications other than the proposed indication, provide separate tables for the frequencies of adverse events occurring in clinical trials.

Cited reasons

  • Unresolved Facility Inspection Deficiencies
  • Inadequate Safety Update Submission
  • Incomplete AE Frequency Tables for Other Indications
  • Missing Case Report Forms and Narratives for Deaths/Discontinuations due to AEs
  • Missing Narrative Summaries for Serious Adverse Events
  • Outdated Clinical Exposure Information
  • The application is not approvable due to unresolved facility inspection deficiencies and significant outstanding issues related to the completeness and presentation of safety data from clinical and nonclinical studies. This includes a required comprehensive safety update, detailed adverse event reporting for all indications, case report forms and narratives for critical safety events, and updated clinical exposure information.

Recommended actions

  • Include a safety update as described at 21 CFR 314.50(d)(5)(vi)(b).
  • The safety update must include data from all nonclinical and clinical studies/trials of the drug under consideration, regardless of indication, dosage form, or dose level.
  • Describe in detail any significant changes or findings in the safety profile.
  • Incorporate new safety data when assembling sections describing discontinuations due to adverse events, serious adverse events, and common adverse events.
  • Present new safety data from studies/clinical trials for the proposed indication using the same format as in the original submission.
  • Present tabulations of the new safety data combined with the original application data.
  • Include tables that compare frequencies of adverse events in the original application with the retabulated frequencies.
  • For indications other than the proposed indication, provide separate tables for the frequencies of adverse events occurring in clinical trials.

Deficiency summary

The application is not approvable due to unresolved facility inspection deficiencies and significant outstanding issues related to the completeness and presentation of safety data from clinical and nonclinical studies. This includes a required comprehensive safety update, detailed adverse event reporting for all indications, case report forms and narratives for critical safety events, and updated clinical exposure information.

Findings

Unresolved Facility Inspection Deficiencies

Severity: critical

The assessment of application approvability is pending resolution of inspection deficiencies. A re-inspection of the facility may be required upon receipt of the complete response. The sponsor must work with the facility to resolve all related deficiencies.

Recommended response: Address all outstanding FDA Form 483 observations and ensure corrective and preventive actions (CAPA) are fully implemented and verified for effectiveness. Coordinate with the facility for potential re-inspection readiness and provide documentation of resolution.

Inadequate Safety Update Submission

Severity: major

A comprehensive safety update, as described at 21 CFR 314.50(d)(5)(vi)(b), is required. This update must include data from all nonclinical and clinical studies/trials of the drug, regardless of indication, dosage form, or dose level, and describe any significant changes or findings in the safety profile.

Recommended response: Prepare a comprehensive safety update covering all nonclinical and clinical studies/trials as per 21 CFR 314.50(d)(5)(vi)(b), detailing any significant changes or findings in the safety profile and incorporating new safety data as specified.

Cited: 21 CFR 314.50(d)(5)(vi)(b)

Incomplete AE Frequency Tables for Other Indications

Severity: major

Separate tables for the frequencies of adverse events occurring in clinical trials for indications other than the proposed indication must be provided.

Recommended response: Generate and submit separate tables detailing adverse event frequencies for all clinical trials conducted for indications other than the primary proposed indication, ensuring consistency in format with the original submission.

Missing Case Report Forms and Narratives for Deaths/Discontinuations due to AEs

Severity: major

Case report forms and narrative summaries are required for each subject who died during a clinical trial or who did not complete a trial because of an adverse event.

Recommended response: Compile and submit all case report forms and detailed narrative summaries for subjects who died or discontinued clinical trials due to adverse events.

Missing Narrative Summaries for Serious Adverse Events

Severity: major

Narrative summaries for all serious adverse events observed in clinical trials must be provided.

Recommended response: Prepare and submit comprehensive narrative summaries for all serious adverse events observed in clinical trials.

Outdated Clinical Exposure Information

Severity: major

Updated exposure information for the clinical studies/trials, including metrics such as the number of subjects and person-time, is required.

Recommended response: Update and submit all clinical exposure information, ensuring accurate reporting of subject numbers and person-time for all studies.

Regulatory context

Submission stage
final decision
Regulatory pathway
NDA

Impact

Impact score
0.95
Estimated delay
365 days
Estimated rework cost
$0
Subsequent action
resubmission

Strategic insights

The primary themes are manufacturing quality system deficiencies impacting approvability and comprehensive clinical safety data reporting gaps, particularly concerning adverse event frequencies, narratives for serious events, and updated exposure information, necessitating a thorough safety update.

Regulatory change impact: Pending sponsor mitigation plan

Approval likelihood after response: 5%

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