A group of Swedish oncologists and hospital physicists have estimated the number 
of patients in Sweden suitable for proton beam therapy. The estimations have 
been based on current statistics of tumour incidence, number of patients 
potentially eligible for radiation treatment, scientific support from clinical 
trials and model dose planning studies and knowledge of the dose-response 
relations of different tumours and normal tissues. It is estimated that in 
paediatric cancers, proton beams are of potential importance in 80-100 children 
annually in Sweden. About 20 of the patients have medulloblastoma. The main 
purpose is to reduce late sequelae, but these are also increased chances to 
avoid myelosupression during e.g. concomitant chemo-radiation and to further 
intensify the chemotherapy.