The Cyclotron Center, delivering proton therapy for certain types of cancer, opened recently in Bronowice, Kraków. We talk to Prof. Marek Jeżabek, Director of the Niewodniczański Institute for Nuclear Physics, PAS, and Prof. Andrzej Kawecki, radiotherapist, clinical oncologist and vice-chairman of the Scientific Board at the Marie Skłodowska-Curie Institute of Oncology.