The set of all Proteins in a living organism; in particular their types and concentrations present at different cell/tissues, or organism wide. The study and analysis of these is known as Proteomics

In addition, iIstill under debate to what extent the full proteome is characterized. Many proteins exist as different isoforms, contain mutations or de- letions, and carry a range of posttranslational modifications. Often, it is subset of these protein forms that are highly relevant for cancer disease progression.