- Sugarbaker's peritoneal cancer index (PCI) will be used to assess peritoneal tumour burden 28. The completeness of cancer resection (CCR) will be assessed by the surgeon at the end of CRS; CCR-0 no macroscopic residual tumour, CCR-1 no residual tumour nodules greater than 2.5 mm, CCR-2 residual tumour nodules larger than 2.5 mm in diameter.