Multiple Cellular and Molecular Pathways

Multiple cellular and molecular pathways" is a collective term for the diverse networks of molecular interactions and signaling cascades that regulate fundamental biological processes in cells, including signal transduction, metabolism, gene expression, and responses to external stimuli[1][4][7][8]. These pathways integrate signals from the environment or other cells, coordinate complex cellular behaviors, and maintain organismal homeostasis. Examples of specific pathways include the MAPK/ERK cascade, PI3K/AKT pathway, Wnt/β-catenin signaling, and many others that mediate cell growth, differentiation, apoptosis, and disease states such as cancer[2][4][6][7]. Because "Multiple Cellular and Molecular Pathways" does not denote a unique molecular target, it cannot be uniquely classified or used to link specific drugs, biomarkers, or mechanisms of action in the manner of a named receptor, enzyme, or transporter.