Can Patients Use Continuous Glucose Monitors During Radiation Therapy for Cancer?

Sally is a 65-year-old patient with T3N1M0 human papillomavirus–negative cancer of the supraglottic larynx who is beginning treatment with radiation and chemotherapy. She has a history of type 1 diabetes mellitus, diabetic retinopathy, diabetic nephropathy, and hospital admissions for diabetic ketoacidosis. She has been using a continuous glucose monitor (CGM) and insulin pump (IP) to help her effectively manage her diabetes. She is concerned that her chemotherapy regimen will involve taking dexamethasone, which will affect her hard-to-control diabetes. Sally tells you she wants to wear her CGM and IP during treatment.