ALFAOMEGA-RETRÒ will be exploited to retrospectively collect clinical and imaging data and archival samples to be used for validation and correlative studies on markers discovered by cutting-edge translational projects within the AIRC5x1000 program "Insights into the evolving heterogeneity of colorectal cancer (CRC): from mechanism to therapies" (an ongoing multi-institutional research program).
Histologically-confirmed diagnosis of colorectal cancer (any stage).
Age >18 years at the time of diagnosis.
Availability of clinically-annotated radio-imaging data and/or diagnostic Formalin-Fixed Paraffin Embedded (FFPE) blocks (surgical resections and/or tumor biopsies), or at least 10 slides (preferably 20). FFPE tissue blocks are always preferred to slides.
Verification that the patient could not be reached for informed consent in accordance with applicable national regulations.
if inclusion criteria are not met