In this article (Cancer Res 2013;73:4616–28), which was published in the August 1, 2013 issue of Cancer Research (1), Fig. 4 was incorrectly labeled because of a production error. The online version has been corrected and no longer matches the print version.

1.
Lutz
NW
,
Le Fur
Y
,
Chiche
J
,
Pouysségur
J
,
Cozzone
PJ
. 
Quantitative in vivo characterization of intracellular and extracellular pH profiles in heterogeneous tumors: a novel method enabling multiparametric pH analysis
.
Cancer Res
2013
;
73
:
4616
28
.