In a March 28 press release, RXi Pharmaceuticals Corp. (RXII:NASDAQ) announced the patent grant from the Japan Patent Office for RXI-109, which is in clinical trials for post-surgical hypertrophic scarring and for retinal scarring associated with age-related macular degeneration. The patent protection extends to 2031.
"This patent increases our ability to protect our novel CTGF (connective tissue growth factor)-targeting compounds, which are based on our proprietary self-delivering RNAi platform," stated the company's chief development officer, Pamela Pavco, in the press release. "The granting of this patent in Japan further strengthens RXi's intellectual property estate for future commercial and regional business development opportunities for RXI-109."
RXi's platform, called sd-rxRNA, consists of "self-delivering" RNAi compounds that can "achieve efficient spontaneous cellular uptake and potent, long-lasting intracellular activity," according to the company.
RXI-109 is currently in Phase 2 studies for post-surgical hypertrophic scarring, where preliminary results show "the use of RXI-109 after scar revision surgery had a visible, beneficial effect on the suppression of hypertrophic scarring, at three months following revision surgery," Pavco stated. Data from the trail is expected by Q4/17.
The compound has also proven "safe and well-tolerated in the eye" in an ongoing Phase 1/2 trial, according to Pavco. That trial is expected to read out in 2018, and while the primary endpoint is to ensure there are no safety issues, the company will also be monitoring the sizes of existing scars, which may give some indication of efficacy.
The company is also using its sd-rxRNA technology to enhance cancer immunotherapies. RXi exercised its option to acquire MirImmune, which had licensed RXi’s sd-rxRNA technology to enhance its immunotherapeutic work, in February, formalizing a long-standing collaboration.
In a recent presentation at the American Association for Cancer Research's annual meeting, RXi illustrated the methodology and results of its platform in a preclinical study of sd-rxRNA-augmented immunotherapy in ovarian cancer. The company's conclusions stated the "sd-rxRNA is a powerful RNAi platform for the silencing of immune checkpoints in therapeutic cells," and that "[e]ffective simultaneous modulation of multiple immune checkpoints by sd-rxRNA provides a flexible tool for improving efficacy of cell-based immunotherapies."
In addition to its sd-rxRNA platform, RXi has a small molecule compound, Samcyprone, which is in Phase 2 for treatment of warts caused by human papillomavirus. Data from that trial is also expected by year-end.
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