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Discordance between original and central laboratories in ER and HER2 results in a diverse, population-based sample.

Abstract：

PURPOSE:To investigate the discordance between original and central laboratories in estrogen receptor (ER) status, in tumors originally deemed to be ER-negative, and in HER2 status in a diverse population-based sample. METHODS:In a follow-up study of 1785 women with Stage I-III breast cancer diagnosed between 2005 and 2007 in the Detroit and Los Angeles County SEER registry catchment areas, participants were asked to consent to reassessment of ER (in tumors originally deemed to be ER-negative) and HER2 status on archival tumor samples approximately four years after diagnosis. Blocks were centrally prepared and analyzed for ER and HER2 using standardized methods and the guidelines of the American Society of Clinical Oncology and the College of American Pathologists. Analyses determined the discordance between original and central laboratories. RESULTS:132 (31%) of those eligible for ER reassessment and 367 (21%) eligible for HER2 reassessment had archival blocks reassessed centrally. ER discordance was only 6%. HER2 discordance by immunohistochemistry (IHC) was 26%, but final HER2 results-employing FISH in tumors that were IHC 2+ at the central laboratory-were discordant in only 6%. Half of the original laboratories did not perform their own assays. CONCLUSIONS:Discordance between original and central laboratories in two large metropolitan areas was low in this population-based sample compared to previously reported patient samples. Centralization of testing for key pathology variables appears to be occurring in many hospitals. In addition, quality improvement efforts may have preceded the publication and dissemination of specialty society guidelines.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Griggs JJ,Hamilton AS,Schwartz KL,Zhao W,Abrahamse PH,Thomas DG,Jorns JM,Jewell R,Saber ME,Haque R,Katz SJ

doi

10.1007/s10549-016-4061-z

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

375-384

issue

2

eissn

0167-6806

issn

1573-7217

pii

10.1007/s10549-016-4061-z

journal_volume

161

pub_type

杂志文章

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