Alastair Greystoke, MBChB, MSc, PhD, MRCP, Northern Institute for Cancer Research, Newcastle University, Newcastle, UK, outlines the problem of pneumonitis associated with immunotherapy. It was shown that 10% of lung cancer patients were admitted with pneumonitis, with this group experiencing poorer survival outcomes. This interview took place at the 18th British Thoracic Oncology Group (BTOG) 2020 congress held in Dublin, UK