Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Colorectal Neoplasms/drug therapy; Colorectal Neoplasms/pathology; Adult; Aged; Antimetabolites, Antineoplastic/administration & dosage; Antimetabolites, Antineoplastic/adverse effects; Antineoplastic Combined Chemotherapy Protocols/administration & dosage; Antineoplastic Combined Chemotherapy Protocols/adverse effects; Capecitabine; Chemotherapy, Adjuvant; Deoxycytidine/administration & dosage; Deoxycytidine/adverse effects; Deoxycytidine/analogs & derivatives; Disease-Free Survival; Drug Administration Schedule; Female; Fluorouracil/administration & dosage; Fluorouracil/adverse effects; Fluorouracil/analogs & derivatives; Gastrointestinal Tract/drug effects; Humans; Lymphatic Metastasis; Male; Middle Aged; Neoplasm Staging; Neutropenia/chemically induced; Oxaloacetates; Papillon-Lefevre Disease/chemically induced; Prospective Studies; Retrospective Studies; Treatment Outcome; Vascular Neoplasms/secondary