biostudies-literatureBeatty JDNational Cancer InstituteNCI NIH HHS388-396https://www.ebi.ac.uk/biostudies/studies/S-EPMC8525779biostudies-literatureUnknown16(2)<h4>Purpose</h4>To test accuracy of patient self-report of breast cancer recurrence for enhancing standard population-based cancer registries that do not routinely collect cancer recurrence data despite the importance of this outcome.<h4>Methods</h4>Potential research subjects were identified in the Breast Cancer Research Database (BCRD) of the Swedish Cancer Institute (SCI). The BCRD has collected data within 45 days of each medical encounter on new primary breast cancer patients receiving all or part of their initial care at SCI. Females diagnosed with a new primary breast cancer 2004-2016, Stages I-III, and alive at the time of study initiation (2018) were identified. Recurrent breast cancer patients were matched 1:1 to surviving non-recurrent patients by patient age, date of diagnosis,Journal of cancer survivorship : research and practiceIdentifying breast cancer recurrence histories via patient-reported outcomes.PMC8525779P30 CA177558UH3 CA218909UG3 CA218909Etzioni RSun QChubak JMarkowitz DBeatty JDHuang BfalseIdentifying breast cancer recurrence histories via patient-reported outcomes.<h4>Purpose</h4>To test accuracy of patient self-report of breast cancer recurrence for enhancing standard population-based cancer registries that do not routinely collect cancer recurrence data despite the importance of this outcome.<h4>Methods</h4>Potential research subjects were identified in the Breast Cancer Research Database (BCRD) of the Swedish Cancer Institute (SCI). The BCRD has collected data within 45 days of each medical encounter on new primary breast cancer patients receiving all or part of their initial care at SCI. Females diagnosed with a new primary breast cancer 2004-2016, Stages I-III, and alive at the time of study initiation (2018) were identified. Recurrent breast cancer patients were matched 1:1 to surviving non-recurrent patients by patient age, date of diagnosis,2022-01-01T00:00:00Z2022 Apr2025-04-26T20:22:28.574Z2025-02-18T23:32:07.604ZS-EPMC85257793385213910.1007/s11764-021-01033-7