Ukrainian oncology suffered a grievous loss. Professor Svitlana Pavlivna Sidorenko, a prominent scientist, head of the Department of Molecular and Cellular Pathobiology of the R.E. Kavetsky Institute of Experimental Pathology, Oncology and Radiobiology of the National Academy of Sciences of Ukraine, a Corresponding member of the National Academy of Sciences of Ukraine, after a long illness, died on August 26, 2018 at the age of 64.