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Table 1 Patient and tumour characteristics by period of diagnosis among patients aged 60–64 years1

From: Remarkable change in age-specific breast cancer incidence in the Swiss canton of Geneva and its possible relation with the use of hormone replacement therapy

Patient and tumour characteristics

1975–1979 1985–1989 N = 218 (%)

1997–2000 2001–2003 N = 389 (%)

P value for X2 of heterogeneity

Social class2

   

   High

8 (6%)

72 (19%)

P < 0.0000

   Medium

57 (44%)

203 (52%)

 

   Low

26 (20%)

53 (14%)

 

   Unknown

39 (30%)

61 (16%)

 

Method of detection

   

   Screening

31 (14%)

199 (51%)

P < 0.0000

   Other

187 (86%)

190 (49%)

 

Stage at diagnosis

   

   I

69 (32%)

186 (48%)

P < 0.0000

   II

95 (44%)

149 (38%)

 

   III and more

34 (16%)

42 (11%)

 

   Unknown

20 (09%)

12 (3%)

 

Oestrogen 3 receptors

   

   Positive

43 (61%)

311 (80%)

P = 0.002

   Negative

18 (25%)

53 (14%)

 

   Unknown

10 (14%)

25 (6%)

 

Histological type

   

   Ductal

173 (79%)

311 (80%)

P < 0.0000

   Lobular

4 (2%)

53 (14%)

 

   Other

41 (19%)

25 (6%)

 
  1. 1) the age in which the incidence peak was observed after 1997
  2. 2) the first period concerned 1985–1989 as information on the woman's last occupation was available only after 1980;
  3. 3) the fist period concerned the years 1995–1996 as information on oestrogen receptor status was available only from 1995.