Significance of the Difference in the Size of Liver Tumors in the Management of Patients with Colorectal Liver Metastases
Kosuke Ichida, Koichi Suzuki, Taro Fukui, Yuji Takayama, Nao Kakizawa, Yuta Muto, Takaharu Kato, Fumi Hasegawa, Fumiaki Watanabe, Yuji Kaneda, Rina Kikugawa, Masaaki Saito
(+6 others)
2017
Journal of Molecular and Genetic Medicine
metastases. The combination of chemotherapy and surgery is currently accepted for the treatment of patients with technically resectable colorectal liver metastases. However, the impact of preoperative chemotherapy on overall survival (OS) remains unclear [11] . Therefore, it is debatable as to whether chemotherapy or surgery should be used as the forward treatment of resectable CRC liver metastases; it has not been established which CRC patients with resectable liver metastases require
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... apy before surgery. The oncological behavior of tumors should be considered to determine patient outcome including the occurrence of latent metastases in preoperative imaging studies. Several studies have reported prognostic risk factors that can be used to predict malignant potential, such as the number, size and distribution of the liver tumors; however, there is no consensus regarding how to apply these characteristics to determine whether chemotherapy is indicated [6, [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] . Abstract Background: The combination of chemotherapy and surgery is currently accepted for the treatment of patients with technically resectable colorectal liver metastases. It is, however, hard to determine which of these modalities should be the forward treatment. In this study, we assessed the usefulness of the difference in tumor size assessed in pretherapeutic imaging in the selection of chemotherapy in these patients. Methods: We present a retrospective review of 80 consecutive colorectal liver metastases without extrahepatic tumors. The relapse-free survival (RFS), progression-free survival (PFS) and overall survival (OS) were evaluated and compared between patients who underwent surgery (n=66) and chemotherapy (n=14) according to clinical features. In particular, we addressed pretherapeutic imaging studies including the distribution and number of metastatic liver tumors. In addition, the ratio of tumor size (largest to smallest tumor) was calculated; two groups classified as R<5 (ratio <5) and R ≥ 5 (ratio ≥ 5) were compared. Results: Univariate analysis was performed in the surgery group; significant differences in RFS were found regarding time of occurrence, the number of tumors and the ratio of tumor diameters. Multivariate analysis showed that the ratio of tumor size, R ≥ 5, was the only independent prognostic risk factor concerning both RFS and OS. We then compared the outcome of patients with prognostic risk factors between surgery and chemotherapy. Surgery achieved significantly better OS than chemotherapy, with the exception of the R ≥ 5 group. No difference in OS, in addition to RFS and PFS, was seen in the R ≥ 5 groups regardless of treatment. Conclusion: Colorectal cancer patients with resectable liver metastases with R ≥ 5 showed no significant difference in outcome using surgery or chemotherapy. Chemotherapy could be used as an alternative to forward surgery to address oncological concerns such as the presence of latent metastases or poor treatment outcome in these patients.
doi:10.4172/1747-0862.1000254
fatcat:ys26sxa4pvgxzkgeukw4xprrym