Recently, a new prognostic score named Colorectal Peritoneal Metastases Prognostic Surgical Score (COMPASS) has been developed (Fig. 1) . This Cox regression-based nomogram includes four prognostic factors: age, PCI score, lymph node status, and single ring cell histology and seemed to perform considerably better than the PSDSS. Future research focusing on external validation of the new COMPASS model is warranted and will give more insight into the possibilities ofthis score for colorectal PM patients treated with CRS and HIPEC 。