Conditional survival of high-grade glioma in Los Angeles County during the year 1990–2000
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Survival probabilities for high-grade glioma are estimated at the time of diagnosis and provide limited information following treatment. This study determined dynamic indices to predict post-diagnosis survival for high-grade glioma patients. Survival information for 2,743 patients with high-grade glioma, diagnosed in Los Angeles County during the years 1990–2000, were used to estimate conditional survival probabilities with 95 % confidence intervals, for patients still alive at 1, 2, 3, 4, or 5 years after diagnosis. The conditional probabilities of surviving one additional year increase as the post-diagnosis survival time increases (from 43 ± 2 % conditional on surviving 1 year after diagnosis to 91 ± 2 % conditional on surviving 5 years after diagnosis). Patients diagnosed with WHO grade III gliomas have higher conditional survival probabilities than those diagnosed WHO grade IV gliomas. However, as the years after diagnosis increase, the differences in the conditional probabilities between the two groups are attenuated. At the time of diagnosis, age and tumor histology (WHO grade), tumor site, primary treatment, time of treatment start after diagnosis, as well as whether the patient was treated at a teaching hospital were significantly associated with overall survival. By 4 years post-diagnosis however, with the exception of age, variables associated with survival at baseline were no longer significantly associated with survival. Conditional survival probabilities provide clinically relevant information for understanding the prognosis for patients with high-grade gliomas.
KeywordsConditional survival High-grade glioma Los Angeles County
The collection of cancer incidence data used in this study was supported by the California Department of Health Services (CADHS) as part of the statewide cancer reporting program mandated by California Health and Safety Code Section 103885; the National Cancer Institutes (NCI) Surveillance, Epidemiology and End Results Program under contract N01-PC-35139 awarded to the University of Southern California, and contract N02-PC-15105 awarded to the Public Health Institute (PHI); and the Centers for Disease Control and Prevention’s (CDC) National Program of Cancer Registries, under agreement #U55/CCR921930-02 awarded to the PHI. The ideas and opinions expressed herein are those of the authors and endorsement by the CADHS, the NCI, and the CDC or their contractors and subcontractors is not intended nor should be inferred.
All authors have no conflicts to report.
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