• Some types of cancer and treatments such as chemotherapy can weaken your immune system and may increase your risk of any infection, including with SARS-CoV-2, the virus that causes COVID-19. During chemotherapy, there will be times in your treatment cycle when you are at an increased risk of infection.
• Adults and children with serious chronic health conditions, including cancer, are at higher risk of developing more serious complications from contagious illnesses such as COVID-19.

References

1. https://www.cancer.net/blog/2020-03/common-questions-about-coronavirus-2019-and-cancer-answers-patients-and-survivors
2. https://www.cancer.gov/contact/emergency-preparedness/coronavirus\
3. https://www.thelancet.com/journals/lanonc/article/PIIS1470-2045(20)30150-9/fulltext 
4. https://www.medscape.com/viewarticle/927215 
5. https://www.nccn.org/covid-19/