* https://www.cancer.gov/about-cancer/treatment/drugs/cancer-type
Example domain - Breast Cancer Drug
* https://docs.google.com/spreadsheets/d/1yKOEn5nlsKzjUntN5-FSqPzIWfufkrEK8R4ogduYbtQ/edit#gid=0
Regimen
* FEC https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=17.04d&ns=NCI_Thesaurus&code=C9595&key=n1986565614&b=1&n=null
* CAF https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=17.04d&ns=NCI_Thesaurus&code=C9533&key=n1986568618&b=1&n=null
* CMF https://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI_Thesaurus&version=17.04d&ns=NCI_Thesaurus&code=C9874&key=n1986568246&b=1&n=null
* https://www.cancer.gov/about-cancer/treatment/drugs/related-conditions
* https://www.cancer.gov/about-cancer/treatment/drugs/off-label
* NCIt browser