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