Precigen's Papzimeos FDA Approval Drives 144% Stock Surge in August

Monday, Aug 25, 2025 12:14 pm ET1min read

Precigen's (PGEN) stock surged 144.4% in August following FDA approval of Papzimeos (zopapogene imadenovec-drba) for treating adults with recurrent respiratory papillomatosis (RRP). The FDA granted full approval based on a phase I/II study that met safety and efficacy endpoints. Papzimeos is the first FDA-approved treatment for adults with RRP, and Precigen plans to initiate commercial launch and commercialization efforts.

Precigen's (PGEN) stock experienced a significant surge of 144.4% in August following the FDA's full approval of Papzimeos (zopapogene imadenovec-drba) for treating adults with recurrent respiratory papillomatosis (RRP). This approval marks a pivotal moment for the biotech company, which has been in the clinical-stage phase of development. The FDA granted the approval based on a phase I/II study that successfully met both safety and efficacy endpoints [1].

Papzimeos is the first FDA-approved treatment for adults with RRP, a rare and debilitating condition that affects the upper and lower respiratory tracts. The approval is based on data from a pivotal study (NCT04724980) that demonstrated a complete response rate of 51% among patients treated with the therapy [2]. This breakthrough offers a significant advancement over the current standard of care, which primarily involves repeated surgeries that can be costly and burdensome for patients.

Precigen, under the leadership of Helen Sabzevari, PhD, CEO, plans to initiate commercial launch and commercialization efforts following the FDA approval. The company aims to make Papzimeos accessible to all adult RRP patients, thereby reducing the need for repeated surgeries and improving patient outcomes.

The stock's performance reflects investor optimism about the potential market for Papzimeos and the company's ability to execute its commercial strategy. However, the approval also introduces new challenges, such as the need to demonstrate early sales performance, secure reimbursement, and transition from historical losses to sustainable revenue.

Precigen's shares have been on the rise but remain potentially undervalued, with community fair values ranging from $0.24 to over $30 per share [3]. The stock's performance will be closely watched as the company navigates its transition to a commercial-stage biotech with a marketed product.

References:
[1] https://simplywall.st/stocks/us/pharmaceuticals-biotech/nasdaq-pgen/precigen/news/precigen-pgen-is-up-968-after-fda-fully-approves-papzimeos-a
[2] https://www.ajmc.com/view/fda-approves-zopapogene-imadenovec-for-recurrent-respiratory-papillomatosis
[3] https://simplywall.st/stocks/us/pharmaceuticals-biotech/nasdaq-pgen/precigen/news/precigen-pgen-is-up-968-after-fda-fully-approves-papzimeos-a

Precigen's Papzimeos FDA Approval Drives 144% Stock Surge in August

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