The PSDSS ranges from 2 to 22, divides patients into four prognostic groups, and can be applied at the time of diagnosis of pmCRC without the need for intraoperative staging. This scoring system has been validated and evaluated in several studies showing that it has some predictive value. However, although PSDSS is a very interesting system as a recent proposition, it is not used in a common practice and not a rule to be as equivalent as PCI, since PCI appeared to be superior to PSDSS in predicting overall and disease-free survival in colorectal PM patients treated with CRS and HIPEC