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Table 1 Distribution and mastectomy rates of non-metastatic 50–69-year-old patients in the canton of St.Gallen 2012–2017 according to stage

From: Screening is associated with lower mastectomy rates in eastern Switzerland beyond stage effects

Distribution of patients

Mastectomy rates

stage

Non-MSP

MSP-detected

stage

Non-MSP

MSP-detected

p-value of difference

I

39%

64%

I

10%

6%

0.068

II

47%

32%

II

27%

15%

0.004

III

14%

4%

III

52%

41%a

0.390

Total no.

807

404

total

24%

10%

< 0.001

  

p < 0.001

    

T1

50%

75%

T1

12%

7%

0.024

T2

42%

23%

T2

29%

16%

0.015

T3+

7%

1%

T3+

75%

60%a

0.470

  

p < 0.001

    

N0

57%

72%

N0

16%

7%

< 0.001

N1

33%

24%

N1

32%

15%

< 0.001

N2+

10%

4%

N2+

42%

33%a

0.519

  

P = 0.004

    
  1. MSP: Organized Mammography screening programme
  2. Non-MSP: Patients invited to, but cancer not detected through MSP
  3. MSP-detected: Patients where cancer was detected through MSP
  4. a rate based on less than 10 patients / less than 7 mastectomies