The use of breast-conserving surgery versus mastectomies for breast cancer resections

  • Charts and Tables

    Charts and Tables

    Figure 4.5

    Use of breast conserving surgery over mastectomy for breast cancer resections (%) – 2014/15-2015/16 fiscal year combined

    Breast-conserving surgery data shown only include women who underwent breast-conserving surgery as a final procedure.

    TR=Territories combined.

    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

    JurisdictionPercent (%)
    ON67.0
    MB66.7
    PE66.7
    NS60.9
    NB57.9
    BC57.3
    AB54.0
    SK47.4
    TR47.3
    NL34.0
    QC–

    Breast-conserving surgery data shown only include women who underwent breast-conserving surgery as a final procedure.

    TR=Territories combined.

    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

    Definition: The percentage of women (aged 18+) receiving a breast cancer resection for whom breast-conserving surgery (BCS) was their final procedure (i.e., where BCS was their first surgery or where a wider excision in the context of BCS was performed within one year of their first surgery).

    Rationale for measurement: Breast-conservation therapy is less invasive than mastectomy and is associated with lower morbidity, improved cosmetic appearance and better psychological outcomes. In addition, mastectomy and breast-conservation therapy yield comparable survival outcomes. Identifying breast conservation surgery rates can indicate variations in practice across provinces, which could help identify opportunities for improving patient experience.

    Measurement timeframe: 2014/15-2015/16 combined

    Denominator: Women with invasive breast cancer who received breast conserving surgery and/or a mastectomy

    Numerator: Women who received breast conserving surgery (BCS) as their final procedure

    Exclusion criteria:

    1. Women younger than 18 years of age
    2. Potential duplicate records are identified as discharges with identical values in some of the data elements. In the event that duplicate records are found, the most recent record is retained, the remaining duplicate records are removed
    3. Invalid Health Card Number
    4. Procedures coded as abandoned
    5. Newborns, stillbirths and cadaveric donors
    6. Invalid procedure date
    7. No discharge procedure laterality assigned
    8. Invalid postal codes

    Data availability: All provinces and territories, except QC

    Stratification: By jurisdiction

    Data source: Canadian Institute for Health Information; Hospital Morbidity Database (HMDB); National Ambulatory Care Reporting System; Alberta Ambulatory Care Reporting System.

    Data retrieval date: November 2017

    Variables details: Not applicable

    Notes from jurisdictions: Not applicable

    Methodology notes:

    1. Analysis was conducted and provided by Canadian Institute for Health Information.
    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.
    4. Based on patient's place of residence.

    Changes to definition compared to previous years: Not applicable

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