Postoperative liver metastasis and genomic variation. Following reclassification of groups based on the presence of absence of the 17p deletion, and comparisons between the A+B and C+D groups, a significant difference was demonstrated between the two groups. Open bar H(−), no postoperative metastasis; gray bar H(+), postoperative metastasis, including heterochronous cases and synchronous cases with recurrence on the liver.