Theranostics is a medical approach that combines diagnostic and therapeutic capabilities in a single agent or procedure. It involves the use of diagnostic tools to identify specific biomarkers or molecular targets associated with a disease, followed by the administration of a therapeutic agent that is designed to selectively target those biomarkers or targets. The goal of theranostics is to provide personalized and precise treatment options that can improve patient outcomes and reduce the risk of adverse effects. This approach is particularly useful in the treatment of cancer, where it can help to identify the specific molecular characteristics of a tumor and tailor treatment accordingly.