Breast cancer resections that are mastectomies

  • Charts and Tables

    Charts and Tables

    Figure 4.23

    Percentage of breast cancer resections that are mastectomies, by province/territory - from 2008/2009 to 2012/2013 fiscal years combined

    The mastectomy data include women who receive a mastectomy first (labeled Index) as well as women who receive breast conserving surgery first followed by a mastectomy within one year (labeled Final).
    Data source: Canadian Institute for Health Information, Hospital Morbidity Database, National Ambulatory Care Reporting System; Alberta Health and Wellness, Alberta Ambulatory Care Reporting System.

    Data Table

    Province/TerritoryType of ProcedureCases Percent (%)Lower bound of 95% confidence intervalUpper bound of 95% confidence interval
    BCIndex4,93537.436.638.3
    BCFinal5,96845.344.446.1
    ABIndex4,35548.347.349.4
    ABFinal4,77953.052.054.1
    SKIndex1,56756.454.658.3
    SKFinal1,76163.461.665.2
    MBIndex1,04830.729.132.3
    MBFinal1,23136.034.437.7
    ONIndex11,92531.931.532.4
    ONFinal13,60036.435.936.9
    QCIndex5,48020.920.421.4
    QCFinal6,64125.324.825.9
    NBIndex86437.535.539.5
    NBFinal1,02444.542.446.5
    NSIndex1,36644.843.146.6
    NSFinal1,55951.249.453.0
    PEIndex19743.338.748.0
    PEFinal22950.345.655.0
    NLIndex86154.251.756.7
    NLFinal1,08668.366.070.6
    TerritoriesIndex9549.041.756.2
    TerritoriesFinal11659.852.566.8

    The mastectomy data include women who receive a mastectomy first (labeled Index) as well as women who receive breast conserving surgery first followed by a mastectomy within one year (labeled Final).
    Data source: Canadian Institute for Health Information, Hospital Morbidity Database, National Ambulatory Care Reporting System; Alberta Health and Wellness, Alberta Ambulatory Care Reporting System.

  • Data specifications

    Data specifications

    Data and measurement considerations

    • Data for this indicator are based on hospital abstract databases maintained by the Canadian Institute for Health Information (CIHI) or data provided to CIHI. There was no linkage with data in provincial cancer registries. Thus data may include women with recurrent disease—although attempts to minimize this were made through the case selection criteria.
    • The data include women with unilateral invasive breast cancer whose surgery occurred between April 2008 and March 2013.
    • The procedure codes used do not differentiate between excisional biopsies and breast-conserving surgery. For this reason, patients who received excisional biopsy followed by mastectomy would have been grouped in the results with patients who received BCS first followed by mastectomy. Additionally, provinces with higher excisional biopsy rates compared to others may show a lower proportion of index mastectomies.
    • Definition: The percentage of surgical resections among women with unilateral invasive breast cancer that are mastectomies.
    • Numerator: Women in the denominator who received a mastectomy first as well as women who received breast conserving surgery (BCS) first followed by a mastectomy within one year
    • Denominator: Women with unilateral invasive breast cancer who received breast conserving surgery and/or a mastectomy
    • Data source: Hospital Morbidity Database, Canadian Institute for Health Information (CIHI); National Ambulatory Care Reporting System, CIHI; Fichier des hospitalisations MED-ÉCHO, ministère de la Santé et des Services  sociaux du Québec; Alberta Ambulatory Care Reporting  System, Alberta Health and Wellness
    • Measurement timeframe: 2007-08 to 2011-12
    • Stratification variables: Province/territory
    • Provinces submitting data: BC, AB, SK, MB, ON, QC, NB, NS, PE, NL and Territories
    • General notes:
      1. The following surgical and diagnostic  codes, as documented in hospital patient records and reported to CIHI, were used to identify diagnoses and procedures per the following:
    1. In order to identify a breast cancer diagnosis, the following ICD-10-CA codes were used: 00, C50.01, C50.09, C50.10, C50.11, C50.19, C50.20, C50.21, C50.29, C50.30, C50.31, C50.39, C50.40, C50.41, C50.49, C50.50, C50.51, C50.59, C50.60, C50.61,   C50.69, C50.80, C50.81, C50.89, C50.90, C50.91,  C50.99. Women with unilateral invasive breast cancer were the focus of this analysis (comprising 98% of women with invasive breast cancer).
    2. In order to identify a mastectomy, the following surgical codes were used according to CCI: 1.YM.89 to 1.YM.92.
    3. The following CCI codes were used to identify a breast conserving surgery: 1.YM.87, 1.YM.88.
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