In the past few years I have found some examples of papers showing photos of mice or rats with very large tumors. Some of these tumors appear to go far beyond what animal ethics guidelines consider to be acceptable.
This post contains images that might be disturbing to some viewers. So, please proceed with caution.
Note: this post has been updated on June 4, to include new information that the author was not affiliated with the RIAAM institute at the time of publishing his papers. The RIAAM takes this false affiliation very seriously and distances itself from the author’s views and ideas.