It was discovered that some of the micrographs in Figure 3 in the article entitled, “The oncopathic potency of Clostridium perfringens is independent of its α-toxin gene” by Zhiyu Li, John Fallon, John Mandeli, James Wetmur, and Savio L.C. Woo (Human Gene Therapy, July 2009, 20(7): 751–758) were duplicated from Figure 4 in the article entitled, “A genetically enhanced anaerobic bacterium for oncopathic therapy of pancreatic cancer” by Li Z, Fallon J, Mandeli J, Wetmur J, Woo SL. (J Natl Cancer Inst. 2008;100(19):1389–1400.)
This instance has been reported to the institutional research integrity committee by the authors and while the outcome of an investigation is pending, all co-authors have requested a retraction from Human Gene Therapy and sincerely apologize to their colleagues.