Below is the five-year survival rate for brain and spinal cord cancer patients treated by Seattle Cancer Care Alliance (SCCA) compared to patients who were treated for brain cancer elsewhere. This information was collected by the National Cancer Data Base (NCDB) for patients who were diagnosed and treated between 2003 and 2006 and then followed for five years.
- SCCA patients are represented by the green line. Their five-year survival rate was 37 percent from the time they were first diagnosed by SCCA. Note that only patients who received all of their care from SCCA are included.
- Patients from the other types of treatment centers—Community Cancer Centers, Comprehensive Community Cancer Centers, and Academic/Research Hospitals—are represented by the yellow line. Their combined five-year survival rate was 22 percent.
The chart above include patients who were diagnosed between 2003 and 2006 and then followed for five years. The five-year observed survival rates are estimated using the actuarial method with one-month intervals. The endpoint is death from any cause (not cancer specific death); patients may have died from causes unrelated to their cancer. Calculations were performed using the NCDB Survival Reports software tool. Survival rates are not displayed when fewer than 30 cases are available, as survival rates calculated from small numbers of cases can yield misleading results and may have very wide confidence intervals.
The outcomes presented in the figures are not risk-adjusted. That is, the NCDB did not account for demographic differences (e.g., age at diagnosis, gender, socioeconomic status, and insurance status), prognostic factors, and comorbidities for SCCA and other hospitals. Also, the NCDB did not account for subjective differences in staging practices among hospitals. For example, it is possible that a cancer considered stage I at one hospital might be considered stage II at another hospital due to practice pattern variations. The outcomes comparisons presented here might have differed if the NCDB had accounted for such demographic and staging differences in our analyses.
The NCDB tracks the outcomes of 70 percent of all newly diagnosed cancer in the United States from more than 1,500 commission-accredited cancer programs. It has been collecting data from hospital cancer registries since 1989 and now has almost 30 million records.