Cochrane analysis of several longitudinal studies for cancer specifically in bitches by breed
Since you already have a few, why don't you go first, as its you that is making that claim to be an expert in this field. I am sure you have plenty of them if this is the case? Zero point me linking you to your own papers.
I outlined that many vets and associations relying on vets suggest its a trade off depending on what age you do neuter or if you do at all, rather than a blanket 3 year or not all approach that you suggested, implying that its the only option.