Nature Reviews Drug Discovery published online: 08 February 2008 | doi:10.1038/nrd2482

In the Conclusions, there is an error in the sentence that says:

We believe that the chances are small that IL21 as monotherapy or combination therapy may be efficacious in late-stage cancers such as stage IV metastatic melanoma or renal cell carcinoma.

The correct version is:

We believe that IL21 as monotherapy or combination therapy may be efficacious in late-stage cancers such as stage IV metastatic melanoma or renal cell carcinoma.