Dose escalation and dose expansion study of GM-CSF encoding adenovirus, ONCOS-102, in combination with anti-programmed death ligand-1 (PDL1) antibody, durvalumab, in adults with peritoneal disease who have failed prior standard chemotherapy and have platinum-resistant or refractory epithelial ovarian cancer or colorectal cancer. This evidence concerns the gene CD274 and disease of peritoneum.