artificial intelligence; Black person; breast cancer/rt [Radiotherapy]; breast radiotherapy; cancer radiotherapy; Caucasian; comorbidity; coronavirus disease 2019; editorial; health care access; health care cost; health disparity; human; low income country; medical physicist; middle income country; pandemic; predictive model; proton therapy; racial disparity; radiation oncology; social determinants of health; social status; structural racism; treatment planning; radiotherapy planning system