Accuracy of cause of death data routinely recorded in a population-based cancer registry: impact on cause-specific survival and validation using the Geneva cancer registry

Table 2 Cause of death among women diagnosed with breast cancer in Geneva between 1970 and 2009: effect of reclassification of the official underlying cause of death by the Geneva Cancer Registry

Cause of death			5′065
Concordant			4′620
Breast cancer			2′508
Other cause			2′112
Discordant			445
Distribution of discordant cases
Revised cause of death	Breast cancer as the official cause of death		Official cause of death	Breast cancer as the revised cause of death
	N	%		N	%
Other tumour	50	19.7	Other tumour	77	40.3
Heart disease	121	47.6	Heart disease	35	18.3
Imprecise code	11	4.3	Imprecise code	37	19.4
Other	72	28.4	Other	42	22.0
	254	100.0		191	100.0

ISSN: 1471-2407