This is the ValueSet that contains all the codes in Cancer Staging System Value Set (http://hl7.eu/fhir/ig/pcsp/ValueSet/mcode-cancer-staging-system-vs) and Cancer Staging System Value Set (http://hl7.eu/fhir/ig/pcsp/ValueSet/mcode-cancer-staging-system-vs). E.g. what you have to deal with if you get resources containing codes in either of them