Abstract: Patient-reported outcome measures (PROMs) are being implemented more frequently in the clinical setting to monitor health-related quality of life. The breast cancer standard set developed by the International Consortium for Health Outcomes Measurement (ICHOM) aims at reducing health care costs by preventing medical errors and unnecessary treatments, supporting informed decision-making, and improving health care quality by allowing physicians to compare their health outcomes data to other providers. It encompasses survival, cancer control, and disutility of care outcomes in addition to selected case-mix factors, which are to be collected at baseline, and a combination of multiple PROM tools to capture long-term degree of health outcomes. It can be used for both the early and the metastatic settings. Implementing PROMs is both complex and time-consuming. This or a similar process will likely become mandatory in developed nations, where value-based health care is becoming increasingly popular.