On October 9, 2025 Akari Therapeutics, Plc (Nasdaq: AKTX), an oncology biotechnology company developing novel payload antibody drug conjugates (ADCs), reported that it has filed two new provisional patent applications with the United States Patent and Trademark Office (USPTO). The first application includes claims protecting Akari’s novel immuno-oncology payload, PH1 (a novel Thailanstatin analog), and its spliceosome modulatory mechanism of action, which is expected to provide a therapeutic benefit by activating the host immune system in the fight against cancer. The second patent filing includes claims for a combination therapy of PH1 pipeline ADCs with other immuno-oncology drugs that alleviate checkpoint inhibition and have demonstrated synergy with immune checkpoint inhibitors (ICIs) in preclinical models. These new patent applications are part of a growing patent portfolio strategy designed to further extend Akari’s proprietary position with respect to the Company’s novel PH1 payload. These filings also build upon Akari’s recent provisional patent filing in late September covering the use of Akari’s ADC platform to target cancer by modulating alternative splicing drivers within cancer cells.

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Abizer Gaslightwala, President and Chief Executive Officer of Akari Therapeutics commented, "The filing of these two patent applications furthers our strategy to establish a framework for building a new class of immuno-oncology ADC therapies and build on the tremendous success of checkpoint inhibitors. We believe the data within our patent applications enable the potential of our PH1 payload to build novel first-in-class immune-oncology ADCs and continue to demonstrate Akari’s advances in our understanding of spliceosome modulation as a strategy to attack cancer. In particular, these two patent applications include data that highlight the unique immuno-oncology action that the PH1 payload can potentially unlock to drive differentiated clinical outcomes and remissions for cancer patients in the future."

"We look forward to sharing more details at the upcoming presentation at the Society for Immunotherapy Cancer (SITC) (Free SITC Whitepaper) Congress as an oral presentation on November 9th to highlight the progress of our exciting research on Akari’s spliceosome modulating payload PH1. These specific provisional patent applications are designed to protect our disclosures at the SITC (Free SITC Whitepaper) conference and increase the scope of our intellectual property estate, which we anticipate will enable long term value creation for Akari and potential partners we elect to work with on our ADC portfolio," concluded Mr. Gaslightwala.

To build on the Company’s current patent estate around the PH1 spliceosome modulating payload, these patent filings include data that highlights the immuno-oncology properties of Akari’s proprietary ADCs as a single agent, as well as a synergistic gain-of-function effects from the synergy created when Akari’s proprietary ADCs are combined with certain checkpoint inhibitors, as compared to either single agent-ADC or immune checkpoint inhibitor therapy.

Checkpoint inhibitors have seen historic success across several cancer types but have only benefited roughly 20-30% of patients as measured by response rates in approved cancer types. Akari’s data underscore the potential for creating a new ADC paradigm for targeting cancer via spliceosome modulation and unlocking the potential of a combination checkpoint inhibitor-PH1 ADC regimen in new and exciting ways.

The Company continues to expand its current ADC pipeline to encompass multiple targets, such as AKTX-101 (Trop2 ADC with PH1 payload), as well as future programs (AKTX-102, undisclosed target with PH1 payload).

(Press release, Akari Therapeutics, OCT 9, 2025, View Source [SID1234656890])