Spatial analysis of advanced-stage ovarian cancer mortality in California.

Abstract:

OBJECTIVE:We sought to determine the impact of geographic location on advanced-stage ovarian cancer mortality in relation to adherence to National Comprehensive Cancer Network (NCCN) treatment guidelines and hospital case volume. STUDY DESIGN:This was a retrospective observational cohort study of patients diagnosed with stage IIIC/IV epithelial ovarian cancer (Jan. 1, 1996, through Dec. 31, 2006) identified from the California Cancer Registry. Generalized additive models were created to assess the effect of spatial distributions of geographic location, demographic characteristics, disease-related variables, adherence to NCCN guidelines, and hospital case volume, with simultaneous smoothing of geographic location and adjustment for confounding variables. RESULTS:A total of 11,765 patients were identified. Twelve of the 378 hospitals (3.2%) were high-volume hospitals (HVH) (≥20 cases/y) and cared for 2112 patients (17.9%). For all patients, the median distance to an HVH was 22.7 km/14.1 miles and 80% were located within 79.6 km/49.5 miles of an HVH. Overall, 45.4% of patients were treated according to NCCN guidelines. The global test for location revealed that geographic position within the state was significantly correlated with ovarian cancer mortality after adjusting for other variables (P < .001). Distance to receive care ≥32 km/20 miles was protective against mortality (hazard ratio [HR], 0.86; 95% confidence interval [CI], 0.79-0.93), while distance from an HVH ≥80 km/50 miles was associated with an increased risk of death (HR, 1.13; 95% CI, 1.03-1.23). The effects of geographic predictors were attenuated when nonadherence to NCCN guidelines (HR, 1.25; 95% CI, 1.18-1.32) and care at an HVH (HR, 0.87; 95% CI, 0.81-0.93) were introduced into the model. CONCLUSION:Geographic location is a significant predictor of advanced-stage ovarian cancer mortality and the effect is primarily related to the likelihood of receiving NCCN guideline adherent care and treatment at an HVH.

journal_name

Am J Obstet Gynecol

authors

Bristow RE,Chang J,Ziogas A,Gillen DL,Bai L,Vieira VM

doi

10.1016/j.ajog.2015.01.045

subject

Has Abstract

pub_date

2015-07-01 00:00:00

pages

43.e1-43.e8

issue

1

eissn

0002-9378

issn

1097-6868

pii

S0002-9378(15)00101-5

journal_volume

213

pub_type

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