Proposal of a novel H category-based classification of colorectal liver metastases based on a Japanese nationwide survey

摘要

Background The conventional H category-based classification for colorectal liver metastases (CRLM) was created by equal weighting of tumor number and tumor size; however, our previous nomogram to predict postoperative disease-free survival demonstrated that CRLM >= 5 as a parameter provided 4.5 times greater impact compared with a largest CRLM size >5 cm.