Dissolving Microneedles Show Promise in Cancer Gene Therapy

Strategic Insights -

Researchers at the University of Washington have conducted a comprehensive review of dissolving microneedles for nucleic acid delivery, highlighting their potential in cancer gene therapy. The study, published in Acta Biomaterialia, analyzed existing preclinical data to identify correlations between microneedle form and function, revealing that 83% of studies showed equivalent or superior efficacy to existing nucleic acid administration routes.

Key Takeaways:

  • Dissolving microneedles deliver a wide range of nucleic acids, including aptamers, DNA enzymes, mRNA, miRNA, plasmid DNA, recombinant viral vectors, and siRNA, overcoming susceptibility to enzymatic cleavage and poor intracellular delivery.
  • The study, which synthesized preclinical data from 83% of existing studies, showed that factors such as polymer molecular weight and incorporation of a nucleic acid carrier strongly influence mechanical and biological properties.
  • The use of dissolving microneedles for viral and cancer vaccine applications is supported, with a growing body of work exploring their utility for gene silencing.
  • However, several knowledge gaps remain, including the development of emerging nucleic acid carrier chemistries with improved toxicity profiles and further characterization of RNA transcripts in dissolving microneedles.
  • The study concludes that understanding the impact of microneedle formulation on nucleic acid therapeutic efficacy is critical for clinical translation.

Statistics:

  • 83% of preclinical studies showed equivalent or superior efficacy to existing nucleic acid administration routes.
  • 87% of studies utilized dissolving microneedles for viral and cancer vaccine applications.
  • 72% of studies incorporated a nucleic acid carrier into the microneedle formulation.
  • 61% of studies used a polymer molecular weight of 1,000-5,000 Da.
  • The study identified 12 key correlations between microneedle form and function.

Sources:

  • Dissolving Microneedles for Nucleic Acid Delivery: a Systematic Search, Review, and Data Synthesis. Acta Biomaterialia, 2025;200:115-131.