The authors would also like to thank Dr. Jing Zhang for providing positive control DNA for activated Kras-mutation from the bone marrow of LSL Kras/+; Mx-1 cre/+ mice, Dr. Paul Lambert for input regarding MmuPV1-mediated anal tumor formation, and Dr. Chad Vezina for insight into investigating sex-hormone driven cancers. Here, KRAS is linked to anus neoplasm.