Concerns about becoming sick from infections are higher when a patient is on chemotherapy, particularly as it relates to your body’s ability to mount an immune response to fight certain infections and the reserves that your body has to fight an infection. This is not different for COVID-19 in general terms, but it’s important to note that we do not know how treatment might interact with COVID-19 specifically. In short, if your treatment is immunosuppressive, this is likely a risk factor.
Reference