Correction: Extensive Profiling of the Expression of the Indoleamine 2,3-Dioxygenase 1 Protein in Normal and Tumoral Human Tissues

In the original version of this article (1), the frequency of IDO1-expressing samples per tumor type, as shown in Table 2 and mentioned in the text, was incorrect. This was due to receipt of misinformation from the source of 10 of the tissue microarray samples that were included in the analysis. In addition, the authors inadvertently used the wrong cutoff for positivity for two other samples. None of these inaccuracies or errors significantly affect the frequencies, outcomes, or overall conclusions of the study. The errors throughout Table 2 and the text have been corrected in the latest online HTML and PDF versions of the article. The authors regret these errors.