*5.4.1.2 Therapeutic component*

The therapeutic component includes drug molecule that is associated with diagnostic component or carrier system. Examples of the former are radiotracerlabeled non-peptide like gallium-68-labeled bisphosphonates for osteoblastic bone metastases and peptide-based molecules such as gallium-68-labeled somatostatin analogs for somatostatin receptor which targets neuroendocrine tumors. Examples of therapeutic components associated with a carrier system are where integrated entities are attaches to macromolecular carrier covalently. In addition to this, drug molecules co-encapsulation is done with diagnostic components such as chelated radiotracers and gadolinium (III), quantum dots, gold nanoparticle into particulate carrier systems namely polymeric nanospheres, liposomes, polymersomes, and mesoporous silica nanoparticles.
