S100B and cancer: Lastly, we found that in cancer conditions, an increase in serum levels of tumour‐derived S100B and HMGB1 (high mobility group box 1) occurs leading to chronic activation/overexpression of RAGE, which induces hallmarks of cancer cachexia (i.e. muscle wasting, systemic inflammation, and release of tumour‐derived pro‐cachectic factors).