On January 12, 2026 Pierre Fabre Pharmaceuticals, Inc. reported a Complete Response Letter (CRL) from the U.S. Food and Drug Administration (FDA) stating that the Agency is unable to approve the tabelecleucel Biologics License Application (BLA) in its present form.

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We are surprised and deeply disappointed by the FDA’s decision, particularly given the urgent and life-threatening unmet medical need faced by patients with Epstein-Barr virus–positive post-transplant lymphoproliferative disease (EBV+ PTLD) after failure of standard-of-care therapy. These patients have no FDA-approved treatment options and a life expectancy often measured in weeks to months.

The BLA was resubmitted following clear alignment with the FDA on the acceptability of the resubmission criteria and fulfillment of the conditions outlined in the January 15, 2025, CRL, which identified a single GMP-related deficiency and raised no concerns regarding safety, efficacy, or trial design. Upon acceptance of the resubmission in July 2025, the FDA granted tabelecleucel accelerated approval status.

In the new CRL, despite acknowledging that the GMP issue had been resolved and raising no safety concerns, the FDA stated that it no longer considers the previously accepted single-arm ALLELE study to be adequate to support accelerated approval and requested a new study. This represents a significant and unexpected change in position, and one that is contrary to extensive dialogue with the Agency over more than five years.

We are concerned that this decision may have far-reaching consequences for the development of rare disease treatments, effectively creating barriers for generating clinical evidence within a unique patient population with ultra-rare conditions thereby significantly delaying—or preventing altogether— patient access to urgently needed therapies.

We firmly believe that tabelecleucel represents an important treatment advance for patients with EBV+ PTLD and that the totality of data supports its efficacy and safety. We intend to engage with the FDA to urgently pursue a path forward, in collaboration with Atara Biotherapeutics (Nasdaq: ATRA) and our clinical and patient partners, to enable timely accelerated approval of tabelecleucel. We continue to be committed to making tabelecleucel available to patients through our Expanded Access Program.

Approval and real-world use of tabelecleucel over several years in multiple countries outside the United States further support its clinical value. We remain fully committed to securing approval of this critical treatment option for U.S. patients and the physicians who care for them.

(Press release, Pierre Fabre, JAN 12, 2026, View Source [SID1234661984])