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Table 1

The numbers and the causes of withdrawals among women selected, and the medical records obtained in the case-control study of the risk for breast cancer death or subsequent invasive breast cancer after a primary diagnosis of DCIS

Causes of withdrawalBreast cancer deathSubsequent invasive breast cancer
Cases selected/obtained 113/109Controls selected/obtained 452/427Cases selected/obtained 162/154Controls selected/obtained 638/591
Invasive cancer in the primary lesion 27 29 11 46 
Diagnosis made by cytology only 17 
History of earlier breast cancer 16 33 
Lobular CIS 57 25 37 
Benign lesion only 13 
Male 
Recurrence before case    
No control available   
No case available  240  146 
Cause of death other than breast cancer 21    
Bilateral or generalized recurrence    
Causes of withdrawalBreast cancer deathSubsequent invasive breast cancer
Cases selected/obtained 113/109Controls selected/obtained 452/427Cases selected/obtained 162/154Controls selected/obtained 638/591
Invasive cancer in the primary lesion 27 29 11 46 
Diagnosis made by cytology only 17 
History of earlier breast cancer 16 33 
Lobular CIS 57 25 37 
Benign lesion only 13 
Male 
Recurrence before case    
No control available   
No case available  240  146 
Cause of death other than breast cancer 21    
Bilateral or generalized recurrence    
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