Cancer associated with obstetric delivery: results of linkage with the California cancer registry
Section snippets
Methods
The database linking maternal and neonatal/infant hospital discharge records to birth and death certificate records among hospitals in California, which report to the California Office of Statewide Health Planning and Development (OSHPD), has been described previously.2., 3. Successful linkage of maternal and neonatal/infant records has been shown to be possible in approximately 98% of cases.3 In the study reported here, an expanded VS/PDD, has been used that utilizes records inclusive of the
Results
A total of 4,539 cases of invasive malignant disease were identified that occurred in the 9-month prenatal to 12-month postpartum interval among women who were in the California birth cohort inclusive of the years 1991 through 1999 (total of 4,846,505 obstetric deliveries), for an overall occurrence rate of 0.94 cases per 1,000 births. This occurrence rate is approximately 32% higher than the occurrence rate reported in our previous study (0.71). Table I shows the number of cases and occurrence
Comment
Our goals in this study were to reevaluate measurements for the occurrence rates of cancers associated with obstetric delivery, more accurately define the timing of dates of cancer diagnosis in relation to obstetric delivery, and to assess how cancer diagnosis timing may affect perinatal and cancer-related outcomes. For this study, we used an expanded perinatal database that includes all births beyond 20 weeks, and a computerized linkage analysis to the CCR to enhance the accuracy of cancer
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