This book discusses different signaling pathways involved in tumor development and progression. It discusses the pathways that allow tumor cells to proliferate, survive, and invade other tissues. Further, the book reviews the signal transduction regulating phagocytosis, production of cytokines, cell division, and differentiation. It elucidates the dysregulation of cellular signal transduction induced by the genetic and epigenetic changes that drive cancer and enumerates the signaling network encompassing the extracellular matrix, blood vessels, and the immune system. Additionally, the book provides mechanistic insights into inhibitors of the receptor tyrosine kinases, BRAF, EGFR, and ALK that improve clinical response and increase the survival of patients with cancer. The book covers the signal transduction pathways that regulate cell cycle progression and genomic stability, providing a mechanistic understanding of the major checkpoint pathways, and reviewing their diagnostic and therapeutic potential. This volume is essential reading for researchers to understand the therapeutic potential of important signaling molecules against cancer.