CD40LG and cancer: If signs or symptoms occur (fever, cough, shortness of breath), they will be examined and investigated with a high-resolution computed tomography (CT) scan of the lungs, COVID-19 specific IgM, IgG antibody assay and a nucleic acid amplification test (NAT) for the SARS-CoV-2 virus.<h4>Main outcomes</h4>The primary end point of this study is to investigate the incidence of COVID-19 in patients being treated for their cancer over a 2-month period.<h4>Randomisation</h4>Randomisation will be performed using randomly permuted blocks.