Validity of the National Death Index to ascertain the date and cause of death in men having undergone prostatectomy for prostate cancer.

Journal Article

Background

The National Death Index (NDI) is a centralized database containing information from death certificates that are frequently referenced by health and medical investigators to ascertain vital statistics. Yet, it commonly includes misclassified causes of death. Since the NDI is frequently relied upon in studies that evaluate outcomes following radical prostatectomy (RP) for prostate cancer (PC), we evaluated its validity by referencing mortality data from the Shared Equal Access Regional Cancer Hospital (SEARCH) database which is a prospectively managed database of 5009 Veterans who underwent a RP at eight Veterans Affairs medical centers between 1982 and 2016.

Methods

We compared vital status, cause of death and date of death from the SEARCH database with the NDI.

Results

A total of 1312 men in SEARCH were deceased, yet the NDI reported 17% (219) of those men as still alive. Among the 1093 men who had concordant vital status in both SEARCH and NDI, the date of death was an exact match within one day, a week, or 31 days in 94%, 97%, 99%, and 100%, respectively. Of those men coded as dying from prostate cancer in the SEARCH database (n = 105), 12% were coded as having died from non-PC causes in the NDI. Meanwhile, among patients coded by the NDI as having died of PC (n = 139), 34% were coded in SEARCH as having died of non-PC causes.

Conclusions

These findings demonstrate that the NDI provides accurate dates of death, but frequently misclassifies whether a death was due to prostate cancer. Studies that rely upon death certificates, as captured in the NDI, may be unreliable to report prostate cancer-specific mortality rates after prostatectomy.

Full Text

Duke Authors

Cited Authors

  • Moghanaki, D; Howard, LE; De Hoedt, A; Aronson, WJ; Kane, CJ; Amling, CL; Cooperberg, MR; Terris, MK; Freedland, SJ

Published Date

  • December 2019

Published In

Volume / Issue

  • 22 / 4

Start / End Page

  • 633 - 635

PubMed ID

  • 31036926

Pubmed Central ID

  • 31036926

Electronic International Standard Serial Number (EISSN)

  • 1476-5608

International Standard Serial Number (ISSN)

  • 1365-7852

Digital Object Identifier (DOI)

  • 10.1038/s41391-019-0146-1

Language

  • eng