Microneedle-based delivery devices for cancer therapy: A review

Macroscale delivery systems that can be locally implanted on the tumor tissue as well as avoid all the complications associated to the systemic delivery of therapeutics have captured researchers' attention, in recent years. Particularly, the microneedle-based devices can be used to efficiently deliver both small and macro-molecules, like chemotherapeutics, proteins, and genetic material, along with nanoparticle-based anticancer therapies. Such capacity prompted the application of microneedle devices for the development of new anticancer vaccines that can permeate the tumor tissue and simultaneously improve the effectiveness of therapeutic agents. Based on the promising results demonstrated by the microneedle systems in the local administration of anticancer therapeutics, this review summarizes the different microneedle formulations developed up to now aimed for application on cancer therapy (mphasizing those produced with polymers). Additionally, the microneedles' general properties, type of therapeutic approach and its main advantages are also highlighted.