Part 1. CTC Technologies -- Affinity -- Physical -- ctDNA -- miRNA -- Exosomes -- Part 2 -- Biology of CTC -- Dormancy -- Culture -- EMT -- ctDNA and Exosomes -- Cells in circulation with CTC -- Part 3 -- CTC Analysis -- IHC, FISH, and other molecular assays -- Functional characterization -- Advanced microscopy and AI -- Analysis of non-cellular circulating markers -- Part 4 -- Clinical Applications of the Liquid Biopsy -- Early detection and cancer screening -- Prognosis and therapeutic monitoring -- Applications in Clinical Trials -- Applications in Drug Development.