I have studied about biodegradable polymer particles for controlled drug release and pre-clinical applications. I fabricated the arbitrary geometric 3D microparticles and disposable glucose sensor using an inkjet printer and bio-ink. And I developed the new polymer particle formulations using the organic solvents having different solubilities which can control the drug release rate from the particles. Recently, my particles have improved using antibody conjugation and radiotracer labeling for in vivo PET imaging. And it shows great potential for the theranostic treatment of glioblastoma.