Study of PRoliferation and Apoptosis in Rectal Cancer, Predictive & Prognostic biOmarkers: Histopathology and Imaging

This study tests biopsy and tissue from patients who have been treated for primary rectal cancer at the Royal Marsden Hospital between 2011 and 2013, who have an mrTRG score at post-chemoradiotherapy MRI. It is a retrospective pilot study to determine the apoptotic and proliferative index count pre and post chemoradiotherapy.