Funding: the article is part of the research project on Creating and maintaining a database of patients undergoing proton therapy for cancer for FMBA, Russia and was conducted under the State Assignment 388-00141-21-00 dated December 24, 2020.

Author contribution: Udalov YuD initiated the publication; Slobina EL delivered medical care and photon irradiation at the first stage of treatment and was responsible for writing the manuscript; Danilova LA chairman of the medical council that proposed treatment strategy; Zheludkova OG pediatric oncologist, that proposed treatment strategy and supervised all stages of treatment; Kiselev VA calculated total radiation doses and their temporal and spatial distribution at all treatment stages; Nezvetsky AV delivered medical care and proton irradiation at the second stage of treatment; Demidova AM planned proton therapy; Ivanov AV responsible for the anesthetic support of the patient's radiation therapy sessions; Dykina AV planned photon therapy.