In the original version of this article (1), 28 of 170 tumors were misclassified. The authors have updated the article text, Fig. 1, and Supplementary Table S3 to accurately reflect the decrease in positive tests from 148 to 125. The error has been corrected in the latest online HTML and PDF versions of the article. The authors regret this error.

1.
Meijer
TG
,
Verkaik
NS
,
Sieuwerts
AM
,
van Riet
J
,
Naipal
KAT
,
van Deurzen
CHM
, et al
Functional ex vivo assay reveals homologous recombination deficiency in breast cancer beyond BRCA gene defects
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Clin Cancer Res
2018
;
24
:
6277
87
.