Sigmoid colon cancer. In this case?

My father has left main triple vessel coronary artery disease, his Haemoglobin went down to 6.80, when did endoscopy and colonoscopy, it was found that he has tumor and it is sigmoid colon cancer which is in stage 4. How should we proceed in this case? IMPRESSION: • Redundant sigmoid colon with approx. 6.5-7 cm segment of sigmoid showing heterogeneously enhancing asymmetric wall thickening measuring ~ 1.8 cm in maximum thickness. Significant pericolonic nodularity and small nodular deposits noted adjacent to involved segment. • Few enlarged heterogeneously enhancing pericolonic nodes as mentioned. Features suggests malignant neoplastic pathology with omental deposits and metastatic nodes as mentioned.