Stage Distribution

  • Charts and Tables

    Charts and Tables

    Figure 3.10

    Distribution of cases by stage at diagnosis for ovarian cancer – 2013 diagnosis year

    Includes BC, AB, SK, MB, NB, NS, PE, NL. ON is not included because ON excludes stage 0 from stage distribution reporting.
    Data for Stage IB, Stage I Not Otherwise Specified, Stage II, and Stage II Not Otherwise Specified suppressed owing to small numbers.
    Data source: Provincial cancer agencies and programs.

    Data Table

    Stage at DiagnosisNumber of CasesPercent (%)Lower bound of 95% confidence intervalUpper bound of 95% confidence interval
    Stage IA6212.19.314.9
    Stage IC6312.39.515.2
    Stage IIA102.00.83.2
    Stage IIB132.51.23.9
    Stage IIC142.71.34.1
    Stage IIIA244.72.96.5
    Stage IIIB142.71.34.1
    Stage IIIC15931.12735.1
    Stage III Not Otherwise Specified407.85.510.1
    Stage IV9518.615.221.9
    Stage Unknown193.72.15.3

    Includes BC, AB, SK, MB, NB, NS, PE, NL. ON is not included because ON excludes stage 0 from stage distribution reporting.
    Data for Stage IB, Stage I Not Otherwise Specified, Stage II, and Stage II Not Otherwise Specified suppressed owing to small numbers.
    Data source: Provincial cancer agencies and programs.

  • Data specifications

    Data specifications

    Definition: The percentage breakdown of incident cases by stage at diagnosis for breast, lung, colorectal, prostate and ovarian cancer

    Numerator: Number of stageable* incident cases in the provincial cancer registry for each stage at diagnosis (stage 0 – IV including occult, “Unknown”)

    Denominator: Total number of stageable incident cases (stage 0 through to “Not Available”)

    Exclusions:

    • Age (at diagnosis) 0 – 17
    • Non-melanoma skin cancer (M8050-8110 with site code C44.0 to C44.9)
    • Colorectal reporting for appendix C18.1
    • Lymphoma codes M-95 to M-98, all sarcoma codes

    Data source: Provincial cancer agencies

    Measurement timeframe: 2013 diagnosis year

    Stratification variable: Stage at diagnosis, disease site (breast, prostate, colorectal, lung (NSCLC, SCLC), ovarian)

    Provinces submitting data: BC, AB, SK, MB, NB, NS, PE, NL

    Province-specific notes:

    • AB: Hematology, sarcoma and melanoma morphologies were removed from the site-specific cancers. All 2012-2013 invasive primaries are collaboratively staged and once coded there should be no cases with missing/not available stage values. Currently “Not Available” indicates the number of cases that have a missing stage at the time of data pull as the registry status was not complete and staging information is still to come. Certain skin c44 with morphologies other than basal-squamous are also not staged according to Alberta Cancer Registry (ACR) rules. For this indicator, codes 8002, 8073 and 8803 are included as NSCLC.
    • SK: The denominator includes incident cases for which stage is recorded as “Not Applicable” since SK does not differentiate between “Not Applicable” and “Not Available” categories.
    • ON: Data submitted exclude stage 0 cases and thus are not presented in the stage distribution figure. ‘Breast’ only includes female breast cancer cases.
    • NB: From 2008 onwards, only the four most common cancers (breast, colorectal, lung and prostate cancers) are staged.

    Notes:

    1. The group stages for cancer incident cases were classified by AJCC Cancer Staging 7th edition.
    2. By AJCC, cancer incident cases are categorized in terms of stage as:
      1. Stageable: including stage 0, stage I through stage IV, stage unknown
      2. Not Applicable: Not stageable through AJCC
      3. Not Available: Cases for which stage data is not available or invalid
      4. Unknown: Cases for which there is insufficient information to ascertain a definitive stage
    3. Stage 0 includes in-situ and invasive cancer cases. Stage occult for lung cancer cases are included as well.
    4. Breast cancer cases only include females.
  • Related indicators