Evaluation of algorithms using administrative health and structured electronic medical record data to determine breast and colorectal cancer recurrence in a Canadian province

Table 1 Variables included in the study

Variable	Data source	Time frame after diagnosis
Breast Cancer
Surgery (mastectomy, lumpectomy, axillary lymph node dissection)	Manitoba Cancer Registry	12 months
Surgery (non-breast site)	Manitoba Cancer Registry	6 months
Chemotherapy	CancerCare Manitoba EMR^c Drug Program Information Network	12 months^a
Radiation therapy	Manitoba Cancer Registry	12 months
Palliative care consultation from oncologist	Medical Claims	6 months
CEA > 10	CancerCare Manitoba EMR Shared Health	12 months^b
Ca 15–3 > 50	CancerCare Manitoba EMR Shared Health	12 months^b
Colorectal cancer
Surgery (bypass or resection)	Manitoba Cancer Registry	12 months
Surgery (liver or lung resection)	Manitoba Cancer Registry	6 months
Chemotherapy	CancerCare Manitoba EMR Drug Program Information Network	12 months^a
Palliative care consultation from oncologist	Medical Claims	6 months
CEA > 10	CancerCare Manitoba EMR Shared Health	12 months^b

^aExcluding individuals who had chemotherapy after a second primary cancer diagnosis treated with surgery.
^bExcluding individuals who had elevated blood markers within 3 months of another primary cancer diagnosis.
^cElectronic medical record

ISSN: 1471-2407