Molecular therapy refers to strategies for delivering a needed gene product to a patient with the goal of improving their health. Genes can be delivered to cells in the body using genetically engineered viruses, and the cells that receive the gene make the protein that the gene encodes. Ex vivo gene therapy, on the other hand, is a cell-based kind of gene therapy in which the patient gets cells that have been modified to create the required gene product. Researchers and healthcare workers can learn about the latest molecular diagnostic and therapeutic techniques, as well as how they are used in precision medicine, in Molecular Diagnosis & Therapy. Molecular imaging and therapy are a new field of study that combines cell biology, molecular biology, and diagnostic imaging to detect and treat disease at the cellular level. Physicians can now see the anatomical structure of a disease with current imaging technology.