Inovio Pharmaceuticals Inc. (INO) got a classic good news, bad news scenario from the FDA on Monday, and investors focused squarely on the bad part. Shares cratered more than 24% as the regulatory reality set in.

Here's what happened: The FDA accepted the company's Biologics License Application for INO-3107, a potential treatment for adults with Recurrent Respiratory Papillomatosis. That's the good news. The not-so-good news? The agency essentially said "thanks, but we're not convinced this qualifies for the fast lane."

The biotech company had filed its application under the accelerated approval pathway, hoping to speed the drug to market. Instead, the FDA assigned it a standard review classification and set a target decision date of October 30, 2026. That's nearly two years away.

The Disease and The Treatment

Recurrent Respiratory Papillomatosis is a rare condition caused by Human Papillomavirus that creates wart-like tumors in the respiratory tract, typically in the larynx or voice box. It's benign but can significantly impact breathing and speaking, often requiring repeated surgeries to remove the growths.

Inovio, which focuses on developing DNA-based medicines, believes INO-3107 offers meaningful advantages over current treatments. The company's application includes data from a Phase 1/2 trial involving adult patients who'd undergone at least two surgeries in the year before treatment.

The filing also featured long-term follow-up data from the original trial participants, showing that most patients continued experiencing clinical benefits during the second twelve-month period after treatment without needing additional doses. That kind of durability is obviously appealing for a condition that typically requires repeated interventions.

The FDA's Concerns

In its acceptance letter, the FDA flagged what it called "a potential review issue." Translation: The agency's preliminary view is that Inovio hasn't submitted adequate information to justify eligibility for accelerated approval.

That's a significant hurdle. The accelerated approval pathway exists for drugs treating serious conditions with unmet medical needs, allowing approval based on surrogate endpoints rather than requiring proof of actual clinical benefit. It's meant to get promising treatments to patients faster.

The FDA also indicated it's not currently planning an advisory committee meeting to discuss the application, which could be interpreted either way. Sometimes it means the path forward is clear, other times it suggests the issues are straightforward enough not to require outside expert input.

What Happens Next

Inovio isn't backing down. The company maintains that INO-3107 provides meaningful therapeutic benefit over existing treatments and meets the criteria for accelerated approval. Management plans to request a meeting with the FDA to discuss how to remain eligible under the accelerated approval program.

Notably, the company said it's not currently planning to seek approval under the traditional pathway. That's a bold stance that suggests either strong confidence in their accelerated approval case or perhaps limited resources to pursue a more extensive traditional approval process requiring additional studies.

The market's reaction suggests investors see this as a setback. Shares traded at $1.73 by Monday's close, down 24.38% for the session. That kind of drop reflects concerns about both the timeline stretching out and the uncertainty around whether the accelerated pathway remains viable at all.

For Inovio, the next few months will be critical. The meeting with the FDA should clarify whether there's a path forward for accelerated approval or if the company will need to reconsider its strategy entirely.