Even though the UKs first high energy proton beam centers are yet to open, it is critical to look forward and see where the field should be moving in the coming years. In this insightful interview, recorded at the 2017 National Cancer Research Institute (NCRI) Conference, held in Liverpool, UK, Adrian Crellin, MB, BChir, MA, FRCP, FRCR, of Leeds Teaching Hospitals NHS Trust, Leeds, UK, gives a forecast of how the field may advance in the short term, with improvements to the technology and a better understanding of where the treatment should be indicated. Dr Crellin also speculates on the long term future of proton beam therapy, including how it may be replaced.