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Cancer Epidemiology, Biomarkers & Prevention
Cancer Epidemiology, Biomarkers & Prevention
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Incidence of Invasive Breast Cancer and Ductal Carcinoma In situ in a Screening Program by Age: Should Older Women Continue Screening?

Bircan Erbas, Alison Amos, Ashley Fletcher, Anne M. Kavanagh and Dorota M. Gertig
Bircan Erbas
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Alison Amos
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Ashley Fletcher
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Anne M. Kavanagh
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Dorota M. Gertig
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DOI:  Published October 2004
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  • Figure 1.
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    Figure 1.

    Age-incidence rates per 1,000 women screens for invasive breast cancer diagnosed at a subsequent screen within BreastScreen Victoria separately for (A) women on HRT and (B) women not on HRT at most recent screen. Fitted curve, cubic smoothing spline fit on the partial residual scale (y-axis); dashed lines, point-wise 95% confidence intervals.

  • Figure 2.
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    Figure 2.

    Age-incidence rates per 1,000 women screens for DCIS diagnosed at a subsequent screen within BreastScreen Victoria separately for (A) women on HRT and (B) women not on HRT at most recent screen. Fitted curve, cubic smoothing spline fit on the partial residual scale (y-axis); dashed lines, point-wise 95% confidence intervals.

Tables

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  • Table 1.

    Rate of diagnosis of breast cancer per 1,000 women screened by age group and first/subsequent screening attendance

    Type of attendanceAge group
    40-4950-6970-74≥75Total
    First attenders93,402312,13929,89518,340453,776
        Invasive breast cancer
        n2541,7532942542,555
        Rate per 1,000 women screened2.75.629.8313.85
        DCIS
        n864146228590
        Rate per 1,000 women screened0.921.332.071.53
    Subsequent attenders27,661506,11787,54524,699646,022
        Invasive breast cancer
        n6920624781272,736
        Rate per 1,000 women screened2.494.075.465.14
        DCIS
        n234147624537
        Rate per 1,000 women screened0.830.820.870.97
    Total121,063818,256117,44043,039
  • Table 2.

    Size (mm), proportion of grade III cancers, and nodal status by age and screening round for screen detected and interval invasive breast cancer

    Type of attendanceAge group
    40-4950-6970-74≥75P*
    Invasive cancer
        First screen
            Cancers (n)2451,711290242
            Mean size (mm)18.0916.1016.2715.740.15
            Grade (n)2541752294253
            Grade III (%)20.8716.6716.6713.830.09
            Nodal status (n)2541,753294254
            Node negative (%)69.2974.2276.1983.46
            Node positive (%)30.7125.7823.8116.54<0.001
        Subsequent screen
            Cancers (n)662,040469125
            Mean size (mm)17.213.8813.4013.660.08
            Grade (n)692,061478127
            Grade III (%)20.2918.1015.0613.390.05
            Nodal status (n)692,061478127
            Node negative (%)71.0180.4984.7390.55
            Node positive (%)28.9919.5115.279.45<0.001
    Interval cancer
        Cancers (n)1126255924
        Mean size (mm)20.6421.3918.6120.750.52
        Grade (n)1066055522
        Grade III (%)49.0638.1830.9145.450.06
        Nodal status (n)1267056627
        Node negative (%)24.6015.7428.7940.74
        Node positive (%)75.4084.2671.2159.26<0.001
    • ↵* Two-sided P's from a nonparametric test for trend. n, nonmissing size, nonmissing grade, and nonmissing nodes.

  • Table 3.

    Size (mm) of invasive cancers diagnosed within BreastScreen Victoria characterized by age and time since previous negative screen

    Time since previous negative screen (mo)Age group
    40-4950-6970-74≥75Total
    <27
        No. screened6,245204,09241,74516,580
        Invasive cancers
        Cancers (n)261,751414822,273
        Mean size16.9713.6613.3512.71
    27-36
        No. screened4,12424,8974,1653,000
        Invasive cancers
        Cancers (n)241733617250
        Mean size17.2514.1713.0812.41
    ≥37
        No. screened4,49315,5031,5411,986
        Invasive cancers
        Cancers (n)161161926177
        Mean size17.5116.9115.2117.46
    P*0.70.0050.60.08
    • ↵* Two-sided P's from a regression of log size and time since previous negative screen for each age group.

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Cancer Epidemiology Biomarkers & Prevention: 13 (10)
October 2004
Volume 13, Issue 10
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Incidence of Invasive Breast Cancer and Ductal Carcinoma In situ in a Screening Program by Age: Should Older Women Continue Screening?
Bircan Erbas, Alison Amos, Ashley Fletcher, Anne M. Kavanagh and Dorota M. Gertig
Cancer Epidemiol Biomarkers Prev October 1 2004 (13) (10) 1569-1573;

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Incidence of Invasive Breast Cancer and Ductal Carcinoma In situ in a Screening Program by Age: Should Older Women Continue Screening?
Bircan Erbas, Alison Amos, Ashley Fletcher, Anne M. Kavanagh and Dorota M. Gertig
Cancer Epidemiol Biomarkers Prev October 1 2004 (13) (10) 1569-1573;
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