Long-term mortality among women with epithelial ovarian cancer: a population-based study in British Columbia, Canada

Nimisha Arora, Aline Talhouk, Jessica N McAlpine, Michael R Law, Gillian E Hanley, Nimisha Arora, Aline Talhouk, Jessica N McAlpine, Michael R Law, Gillian E Hanley

Abstract

Objectives: Among women with epithelial ovarian cancer (EOC), histotype is one of the major prognostic factors. However, few data are available on histotype- specific survival and mortality estimates among these patients. We therefore examined survival and causes of death among women with EOC by histotype.

Methods: A population- based cohort including all ovarian cancer patients diagnosed in British Columbia (BC) between 1990 and 2014 was built using population-based administrative datasets. We compared causes of death within histotypes, by age at diagnosis, BRCA status, and time since diagnosis.

Results: A total of 6975 women were identified as having been diagnosed with EOC between 1990 and 2014 in BC. The most common cause of death among these women was ovarian cancer until 10 years post diagnosis when other causes surpassed ovarian cancer as the leading cause of death. Among women with serous EOCs, ovarian cancer was the leading cause of death 12 years after diagnosis, whereas ovarian cancer was the leading cause of death for 8 years among women with non- serous EOCs. Among women with serous EOCs, ovarian cancer was the leading cause of death for 12 years among younger women (< 60 years of age) compared to 8 years among women > = 60 years of age, and those with BRCA mutations were more likely to die from ovarian cancer than those without a BRCA mutation.

Conclusions: Within 10 years from diagnosis, ovarian cancer is the leading cause of death among women diagnosed with EOC.

Keywords: Histotype; Mortality; Ovarian Cancer; Survival.

Conflict of interest statement

Ethics approval and consent to participate

The University of British Columbia’s behavioural research ethics board has approved the study. As the data linkage maintained patient anonymity (all identifiers were removed before being provided to the researchers) and the population-based administrative datasets in BC operate based on passive consent (i.e. patients may withdraw their consent and their data will be removed from the administrative datasets), direct patient consent was not required.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
a: Frequency distribution of deaths among patients diagnosed with all the histotypes. b: Frequency distribution of deaths among patients diagnosed with serous epithelial ovarian cancers. c: Frequency distribution of deaths among patients diagnosed with non- serous epithelial ovarian cancers
Fig. 2
Fig. 2
a: Frequency distribution of deaths among older patients (60 years or more) diagnosed with serous epithelial ovarian cancers. b: Frequency distribution of deaths among younger patients (under 60 years) diagnosed with serous epithelial ovarian cancers. c: Frequency distribution of deaths among older patients (60 years or more) diagnosed with non- serous epithelial ovarian cancers. d: Frequency distribution of deaths among younger patients (under 60 years) diagnosed with non- serous epithelial ovarian cancers

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