{Reference Type}: Journal Article {Title}: RB1: governor of the cell cycle in health and disease-a primer for the practising pathologist. {Author}: Cordier F;Creytens D; {Journal}: J Clin Pathol {Volume}: 77 {Issue}: 7 {Year}: 2024 Jun 19 {Factor}: 4.463 {DOI}: 10.1136/jcp-2024-209480 {Abstract}: RB1 stands as the pioneering discovery in tumour-suppressor genes, marking a pivotal breakthrough in comprehending cancer development. This overview delves into the role of RB1 in both health and disease, exploring its association with the tumourigenesis of various cancers and a distinct subset of soft-tissue neoplasms. Additionally, we discuss the application of immunohistochemistry and fluorescence in situ hybridisation to detect RB1 alterations.