Letters sent between 2012 and 2017 to the Cochrane Gynaecological, Neuro-oncology & Orphan Cancer Group (CGNOCG), senior editor of the HPV vaccines Cochrane review, and to Cochrane Editor in Chief David Tovey. These letters contain the analysis of Conflicts of Interest (COIs) in the review authors panel and point to methodological flaws in the review protocol. These letters have not been published. Cochrane communicated to us that received our letters and intervened on the most serious cases of conflicts of interest, dismissing some of the authors; in December 2013 the authors’ panel was indeed reconstituted. However, two authors, including the lead author, Marc Arbyn with COIs with Merck, Sanofi Pasteur MSD and GSK remained on the panel.