NPM-Patch: A conceptual AI-enabled closed-loop microneedle system for tetrodotoxin delivery via Tet1-functionalized hollow silica nanoparticles in refractory cancer pain

Abstract

Refractory cancer pain remains challenging to manage, particularly in advanced disease, in which opioid-based therapies may provide inadequate analgesia and are frequently limited by dose-related adverse effects. Tetrodotoxin (TTX), a selective blocker of voltage-gated sodium channels, represents a potential non-opioid analgesic; however, its clinical application is constrained by a narrow therapeutic window, limited tissue targeting, and the risk of systemic toxicity. This narrative review presents the NPM-Patch (Neuro-Precision Marine Patch), a conceptual drug-delivery framework integrating Tet1-functionalized hollow silica nanoparticles, a pH-responsive microneedle matrix, and an artificial intelligence–enabled closed-loop control system. Conceptually, this framework could improve neuronal targeting, facilitate controlled and sustained TTX release, and permit adaptive dose regulation based on physiological feedback. A dual-trigger release mechanism is proposed to favor localized drug release while potentially reducing systemic exposure and unintended central nervous system delivery. The integration of neuron-targeted nanocarriers, minimally invasive transdermal administration, and adaptive dose regulation may provide a basis for developing a precision-oriented approach to refractory cancer pain. However, the feasibility, pharmacokinetics, targeting specificity, analgesic efficacy, device reliability, and safety of this concept require rigorous preclinical evaluation before its potential clinical translation can be assessed.