In this article (Cancer Res 2012:979–89), which was published in the February 15, 2012, issue of Cancer Research (1), the structure shown in Fig. 1A is incorrect. The correct structure is below. The authors regret this error.

1.
Aris
SM
,
Pommier
Y
. 
Potentiation of the novel topoisomerase I inhibitor indenoisoquinoline LMP-400 by the cell checkpoint and Chk1-Chk2 inhibitor AZD7762
.
Cancer Res
2012
;
72
:
979
89
.