Highlights This ESO-ESMO ABC 5 Clinical Practice Guideline provides key recommendations for managing advanced breast cancer patients. It provides updates on managing patients with all breast cancer subtypes, LABC, follow-up, palliative and supportive care. Updated diagnostic and treatment algorithms are also provided. All recommendations were compiled by a multidisciplinary group of international experts. Recommendations are based on available clinical evidence and the collective expert opinion of the authors.

The ABC community strongly calls for clinical trials addressing important unanswered clinical questions in this setting, and not just for regulatory purposes. Clinical trials should continue to be performed, even after approval of a new treatment, providing real world performance of the therapy. Expert opinionVoters: 43 Yes: 100%Every advanced breast cancer patient must have access to optimal cancer treatment and supportive care according to the highest standards of patient centered care, as defined by:Open communication between patients and their cancer care teams as a primary goal.Educating patients about treatment options and supportive care, through development and dissemination of evidencebased information in a clear, culturally appropriate form. Encouraging patients to be proactive in their care and to share decision-making with their health care providers.Empowering patients to develop the capability of improving their own quality of life within their cancer experience. Always taking into account patient preferences, values and needs as essential to optimal cancer care. Expert opinion Voters: 44 Yes: 100% We strongly recommend the use of objective scales, such as the ESMO Magnitude of Clinical Benefit Scale or the ASCO Value Framework, to evaluate the real magnitude of benefit provided by a new treatment and help prioritize funding, particularly in countries with limited resources. Expert opinion Voters: 40 Yes: 87.5% (35) Abstain: 5% (2) The use of telemedicine oncology to help management of patients with ABC living in remote places, is an important option to consider when geographic distances are a problem and provided that issues of connectivity are solved. Expert opinion Voters: 42 Yes: 92.8% (39) Abstain: 4.7% (2) Strong consideration should be given to the use of validated PROMs (patient-reported outcome measures) for patients to record the symptoms of disease and side effects of treatment experienced as a regular part of clinical care. These PROMs should be simple, and user-friendly to facilitate their use in clinical practice, and thought needs to be given to the easiest collection platform, e.g. tablets or smartphones. Systematic monitoring would facilitate communication between patients and their treatment teams by better characterizing the toxicities of all anticancer therapies. This would permit early intervention of supportive care services enhancing quality of life 1 C Voters: 39 Yes: 87.1% (34) Abstain: 5.1% (2)As survival is improving in many patients with ABC, consideration of survivorship issues should be part of the routine care of these patients. Health professionals should therefore be ready to change and adapt treatment strategies to disease status, treatment adverse effects and quality of life, patients' priorities and life plans. Attention to chronic needs for home and family care, job and social requirements, should be incorporated in the treatment planning and periodically updated. Expert opinion Voters: 40 Yes: 95% (38) Abstain: 5% (2) ABC patients who desire to work or need to w...

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