COVID-19(9) Cancer(4) risk of COVID-19(4) Radiotherapy(3) SARS-CoV-2(3) risk(3) conducted(2) reduced fractionation(2) Breast(2) percentages(2) NIH(2) outcome(2) COVID-19 pandemic(2) fraction(2) heart(2) lung cancer(2) multivariable(2) co-morbidity(2) analysed(2) Evidence(2) Logistic regression(2) increase in(2) 95% confidence interval(2) SARS-COV-2 infection(2) demographics(2) took place(2) hospitalised patient(2) inclusion criteria(2) with COVID-19(2) China(2)