N4 Pharma Plc, a specialist pharmaceutical company, develops silica nanoparticle delivery systems to enhance the cellular delivery of cancer treatments, gene therapy, and vaccines in the United Kingdom. It develops Nuvec, which offers silica nanoparticles with irregular surface structure and polyethyleneimine that traps and protects nucleic acid; and Liptide, a platform to deliver a proprietary siRNA sequence to silence a fibrotic gene for the treatment of glaucoma. The company was incorporated in 1979 and is based in London, the United Kingdom.