Table:
Missing	n(%)
ER	16,247 (9.0%)
PR	21,306 (11.8%)
HER2*	45,021 (24.9%)
Tumor grade	10,594 (5.9%)
Unknown cause of death	2,386 (1.5%)
Total cases with one or more of the above variables missing†	57,695 (31.9%)
Total cases with complete data	123,395 (68.1%)

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| Missing | n(%) | 
 | --- | --- | 
 | ER | 16,247 (9.0%) | 
 | PR | 21,306 (11.8%) | 
 | HER2* | 45,021 (24.9%) | 
 | Tumor grade | 10,594 (5.9%) | 
 | Unknown cause of death | 2,386 (1.5%) | 
 | Total cases with one or more of the above variables missing† | 57,695 (31.9%) | 
 | Total cases with complete data | 123,395 (68.1%) |