Retraction Note: Pre-treatment DWI as a predictor of overall survival in locally advanced pancreatic cancer treated with Cyberknife radiotherapy and sequential S-1 therapy.

The authors have retracted this article because Figs. 2, 3 and 4, as well as parts of the text have been previously published [1]. This article is therefore redundant. Yu Zhang, Denghui Liu, Jiaqi Song, Huojun Zhang and Jianping Lu agree to this retraction. Xiaofei Zhu has not responded to any correspondence from the publisher about this retraction.