Retraction Note: Cancer Chemother Pharmacol (2016) 78:191–197 https://doi.org/10.1007/s00280-016-3075-x

The Editors-in-Chief have retracted this article at the request of the corresponding author Takashi Nojiri. Errors have been identified in the calculation of results, statistical analysis and reporting of sample numbers which affect the data in Fig. 1b, Fig. 2a, Fig. 2b, Fig. 2c and Fig. 4. In addition, the primers used in the experiment reported in Fig. 3 were incorrect and so the data shown in this figure are not valid. Takashi Nojir and Toru Kimura agree with this retraction. The Publisher has not been able to obtain current email addresses for Hiroshi Hosoda, Masahiro Zenitani, Takeshi Tokudome, Koichi Miura, Mikiya Miyazato, Meinoshin Okumura and Kenji Kangawa.