“…While the first addressed the advantages and cost-effectiveness of PT, the second focused on practical aspects of 4D thoracic treatments and technical requirements. The clinical implementation of these recommendations and guidelines ( Table 1 ) was summarised in the most recent surveys on pattern of practice approaching harmonisation of 4D treatment approaches [8] , [9] , [140] . It has been well understood that respiratory motion management is essential for treatment sites located in the thorax and abdomen with breath-hold gating (for (left-sided) breast cancer) widely implemented in conventional photon therapy.…”