However, questions have been mounting about his research, both on PubPeer (which has critical comments for 15 papers he’s an author on) and in other stem cell labs, who have not been able to reproduce much of Hanna’s work.
On December 5, Hanna told us:
The Pubpeer comments have been brought to my attention earlier this week, and I am working with my former PhD advisor [Ofer Mandelboim] to correct the unfortunate and inadvertent mistakes in due course and ASAP.
Six of Hanna’s papers have been cited more than 500 times, according to Thomson Scientific’s Web of Knowledge. The most-cited, with more than 1,000 citations, was a 2008 Nature paper.
Many of the PubPeer comments on a 2010 paper in PNAS focus on other labs being unable to recreate the Hanna lab’s findings. According to September 2014 comments left on a Nature paper, supposedly by Hanna himself, an updated protocol for his method of manipulating stem cells is available on his website.
We’ve asked Hanna for further information regarding these allegations. Hopefully we’ll find out more soon.
Update, 2 p.m. Eastern, 12/17/14: Corrected name of Hanna’s PhD supervisor. Also corrected citation information; previous post only included papers with Hanna JH as author, but most of Hanna’s highly cited papers are Hanna J.