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A new macroscopic classification predicts prognosis for patient with liver metastases from colorectal cancer.

OBJECTIVE
The authors defined a new macroscopic classification of liver metastases from colorectal cancer.


SUMMARY BACKGROUND DATA
There were different prognostic results after the same operative procedure for liver metastases with similar background factors.


METHODS
Eighty-one resected liver metastases were classified into simple nodular (SN) or confluent nodular (CN) types according to the characteristics of the cut surface of the tumor.


RESULTS
The 5-year survival rates after hepatectomy were 41.7% for the SN lesions (n = 39) and 23.1% for the CN lesions (n = 42). The difference between the survival curves was statistically significant (p = 0.0307). Multivariate analysis using Cox's proportional hazards model revealed that the macroscopic type (p = 0.023), the tumor diameter (p = 0.0001), and the presence of lymph node metastases (p = 0.0016) were statistically significant independent prognostic factors.


CONCLUSION
The new macroscopic classification may be valuable as a prognostic factor reflecting the biologic behavior of liver metastases.