Squamous Cancers of the Rectum Demonstrate Poorer Survival and Increased Need for Salvage Surgery Compared With Squamous Cancers of the Anus.

BACKGROUND:Squamous cell cancers of the anus are rare GI malignancies for which neoadjuvant chemoradiation is the first-line treatment for nonmetastatic disease. Squamous cancers of the rectum are far less common, and it is unclear to what degree chemoradiotherapy improves their outcomes.OBJECTIVE:T