A retrospective ,non-interventional tissue study using archival materials collected through a patient's routine care, EVIDENCE aims to demonstrate that distant metastases in colorectal cancer are related to Extramural Venous Invasion (EMVI) and tumour deposits, not lymph nodes. As EVIDENCE is a retrospective study, there are no time dependent schedules for Case Report Form (CRF) completion or tissue submission.
It will be tested whether the vascular route of spread (as evidenced through EMVI and tumour deposits) is more important than lymph nodes in the development of metastatic disease. The sub-clonal origins of primary colorectal cancers, EMVI, tumour deposits, lymph nodes and distant metastases by reconstructing phylogenetic trees will be compared. A proof for a vascular route of spread rather than lymph nodes would lead to a paradigm shift in future decision making at national and international level.
