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Telix has received a Complete Response Letter from the United States Food and Drug Administration for the Biologics License Application (BLA) for TLX250-CDx (Zircaix®, 89Zr-DFO-girentuximab), an investigational PET2 agent for the diagnosis and characterization of renal masses as clear cell renal cell carcinoma (ccRCC).
The CRL identifies deficiencies relating to the Chemistry, Manufacturing, and Controls package. The FDA has requested additional data to establish comparability between the drug product used in the ZIRCON Phase 3 clinical trial and the scaled-up manufacturing process intended for commercial use. Additionally, the FDA has documented notices of deficiency (Form 483) issued to two third-party manufacturing and supply chain partners that will require remediation prior to resubmission.
Telix believes these concerns are readily addressable and submission remediation will begin immediately. The Company will request a Type A meeting with the FDA as soon as practicable to address the deficiencies and determine an appropriate timeframe for resubmission. TLX250-CDx has a Breakthrough Therapy designation and Priority Review status, acknowledging its importance in addressing a significant unmet medical need and clinically demonstrating benefit over available diagnostics.
Dr. Christian Behrenbruch, Managing Director and Group CEO, said, “
TLX250-CDx breaks new ground as a highly novel biologic-based PET imaging agent using a first-in-class isotope. Like many radiopharmaceuticals, it has a complex supply chain, and as the field advances this creates new challenges around the regulatory framework applied to these products. We believe the outstanding matters are resolvable and that we can address the remaining FDA requests within a reasonable time frame.”
The CRL does not impact Telix’s stated revenue guidance for 2025, as guidance excludes revenue forecasts from unapproved products. The Company intends to continue to provide patient access to TLX250-CDx through the FDA-approved expanded access program, subject to consultation with the FDA.