Research Open Access Omar Abdel-Rahman and Scott North May 06, 2021 9 (2) E474-E481; DOI: https://doi.org/10.9778/cmajo.20200186 Abstract Background: Cost-related medication underuse (CRMU) has been reported within the general population in Canada. In this study, we assessed patterns of CRMU among Canadian adults with cancer. Methods: This is a cross-sectional study using survey data.