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Original Article |
1 Colorectal Surgery Division, National Cancer Center Hospital, 5-1-1, Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan
2 Hepatobiliary and Pancreatic Surgery Division, National Cancer Center Hospital, 5-1-1, Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan
Correspondence: Address correspondence and reprint requests to: Takayuki Akasu, MD; E-mail: takasu{at}ncc.go.jp
| ABSTRACT |
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Methods: Clinicopathologic data for 111 consecutive patients with colorectal liver metastasis who underwent second hepatectomy at a single institution between 1985 and 2004, and for whom complete clinicopathologic reports were available, were subjected to univariate and multivariate analyses.
Results: The morbidity and mortality rates were 14% and 0%, respectively, and the overall 5-year survival rate was 41%. Multivariate analysis revealed that synchronous resection for the first liver metastasis (hazard ratio, 1.8), more than three tumors at the second hepatectomy (1.9), and histopathological involvement of the hepatic vein and/or portal vein by the first liver metastasis (1.7) were independently associated with poor survival. We used these three risk factors to devise a preoperative model for predicting survival. The 5-year survival rates of patients without any risk factors, and with one, two, or three risk factors, were 62%, 38%, 19 %, and 0%, respectively.
Conclusions: Second hepatectomy is beneficial for patients without any risk factors. Before second hepatectomy, chemotherapy should be considered for patients with any of these risk factors, especially with two or three factors, in the adjuvant or neoadjuvant setting to prolong survival. These results need to be confirmed and validated in another data set or future prospective trial according to the scoring scheme we outline.
Key Words: Second hepatectomy Colorectal cancer Liver metastasis Prognostic factor Neoadjuvant chemotherapy
| INTRODUCTION |
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The purpose of this study was to find criteria that could be used to identify patients with recurrent liver metastases from colorectal cancer before surgery who would have a poor prognosis after second hepatectomy.
| MATERIALS AND METHODS |
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We investigated 27 clinicopathologic variables pertaining to patient characteristics, clinical data, and histopathologic findings, such as sex, age, primary cancer location, lymph node status, timing of first hepatectomy, number of hepatic metastases, tumor diameter, tumor distribution, preoperative serum carcinoembryonic antigen level, extent of liver resection, surgical margin, venous invasion by liver metastases, and bile duct invasion. The extent of liver resection was defined according to the nomenclature; wedge, segmental, and bisegmental resections were classified as minor resection, and hemihepatectomy or more extended resections were classified as major resection. Patient outcomes were determined on the basis of clinical data obtained from the files as of August 2005. The median follow-up period for the 111 patients after second liver resection was 43 months (range, 1207 months).
The prognostic significance of clinicopathologic factors in relation to survival was investigated by univariate and multivariate analyses. Data were censored in the analysis of overall survival if a patient was alive, and in the analysis of disease-free survival if a patient was alive without recurrent colorectal cancer. Survival rates were calculated by the Kaplan-Meier method and compared statistically by the log-rank test. Univariate comparisons of survival were performed by the log-rank test and multivariate analysis by the Cox regression model with the forward stepwise method (likelihood ratio). All variables were dichotomized for analysis. All statistical analyses were performed by SPSS for Windows, version 6.0 (SPSS-Japan Inc., Tokyo, Japan). All P values were two-sided, and differences at P < .05 were considered to be statistically significant.
| RESULTS |
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Clinical Features and Pathology
Primary Tumor
The site of the primary cancer was the colon in 75 patients (68%) and the rectum in 36 (32%). Histologically, there were 50 well-differentiated, 58 moderately differentiated, and 1 poorly differentiated adenocarcinoma, and 2 mutinous carcinomas. Metastatic lesions in the liver were found synchronously with the primary tumor in 58 patients (stage IV). Of the 53 patients with metachronous liver metastases, 13 patients had no lymph node metastasis (stage I or II), and 40 patients had lymph node metastasis (stage III).
First Liver Resection
Of the 53 patients with metachronous liver metastases, the median interval between the primary resection and the first hepatectomy was 16 months (range, 460 months), and 25 patients (47%) underwent the second hepatectomy within 12 months. Unilobar involvement was observed in 68 patients and bilobar involvement in 43. At the first hepatectomy, 43 patients had a solitary hepatic lesion, 67 had 2 to 12 (median, 3) metastatic nodules, and one patient had more than 50 lesions. The median size of the largest hepatic lesion was 3.3 cm (range, 1.210 cm). Minor resection was performed in 93 patients and major resection in 18. The median blood loss was 698 mL (range, 503215 mL). Blood transfusion was performed in 17 patients. The surgical margin was negative in 89 patients and positive in 22. Invasions of the portal vein or hepatic vein by the liver metastases were found in 22 patients, and bile duct involvement was found in 39.
Second Liver Resection
The median interval between the first hepatectomy and detection of recurrence was 13 months (range, 292 months). Sixty-two patients had a solitary metastasis, and 49 had multiple metastases. The recurrent metastases ranged from 1.2 to 10 cm (median, 3.3 cm) in greatest dimension. Before second hepatectomy, pulmonary resection for lung metastasis was conducted in eight patients, and three patients underwent second hepatectomy and pulmonary resection simultaneously. After first hepatectomy, performed mostly in the 1980s, nine patients received adjuvant hepatic arterial infusion chemotherapy with 5-fluo-rouracil (5-FU), mitomycin C, and oral carmofur regimen,7 and six patients received oral anticancer drugs for adjuvant therapy (carmofur in five patients, uracil-tegafur in one). Two patients who underwent colectomy plus simultaneous hepatectomy received adjuvant intravenous 5-FU plus leucovorin or mitomycin C, and one who had initially unresectable liver metastases was provided irinotecan for downstaging.
The second hepatectomy procedures included minor resection in 99 patients, hemihepatectomy in 6 patients, extended hemihepatectomy in 5, extended hemihepatectomy with bile duct reconstruction in 1, and central bisectionectomy in 1. Ninety-three patients had negative margins and 18 had positive margins. The median blood loss during the second liver resection was 913 mL (range, 954803 mL), and 22 patients received blood transfusions. No patient died during the perioperative course. Complications occurred in 16 patients (14%), including bile leakage in 8, abscess formation in 4, pleural effusion in 3, cholangitis in 1, and wound infection in 1. Invasions of the portal vein or hepatic vein were found in 25 patients, and bile duct involvement was found in 40.
Survival and Recurrence After Second Hepatectomy
Of the 111 patients who underwent second hepatectomy with curative intent, 61 had died by August 31, 2005. Overall 1-, 3-, and 5-year survival rates were 91%, 74%, and 41%, respectively, from the time of second liver resection, with a median survival of 43 months (Fig. 1
). There were 23 actual 5-year survivors. Recurrence after second hepatectomy occurred in 74 patients. Of these, 39 patients developed liver metastases (27 confined to the liver; 12 involving the liver plus other sites), and 37 developed lung metastases. Of them, 21 patients underwent surgery, including 13 third hepatectomies and 8 pulmonary resections. Twenty-seven patients experienced recurrence within 6 months after the second hepatectomy, and their median survival time was significantly worse than that of the others (15 vs. 60 months, P = .0001). Forty-four of the patients who experienced recurrence after second hepatectomy received chemotherapy for treatment. Hepatic arterial infusion chemotherapy was performed in seven patients who had isolated hepatic recurrence. 5-FU was given by infusion to 14 patients; seven received additional mitomycin C. Oral chemotherapy drugs were administered to 7 patients (uracil-tegafur plus leucovorin in 2, S-1 [tegafur/5-chloro-2,4-dihydroxy-pyridine/potassium oxonate] in 3, capecitabine in 1, and carmofur in 1), and intravenous 5-FU plus leucovorin was provided to 11. Twenty patients received irinotecan, eight received oxaliplatin, and one received bevacizumab. Irinotecan has been commonly used since 1999 in Japan, and most of the patients who experienced recurrence after 1999 benefited from irinotecan. The group that developed recurrence until 1998 (n = 19) had significantly worse survival than those after 1999 (n = 25) (median survival time, 23 months vs. 55 months, P = .004).
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Factors Related to Second Hepatectomy
The 5-year survival was significantly better for patients with a disease-free interval of more than 6 months between the first hepatectomy and recurrence, as compared with patients with a disease-free interval of less than 6 months (49% vs. 22%, P = .02). Patients who had less than four nodules had significantly better survival than those with four or more (45% vs. 18%, P = .001). The size of the largest lesion at the second operation influenced survival, but not to a significant degree (P = .09). Similar to the first hepatectomy, patients who received blood transfusions showed significantly worse survival (P = .03), and bilobar involvement, extent of hepatectomy, and serum carcinoembryonic antigen level were not prognostic factors. Patients who had undergone resection of extrahepatic disease before second hepatectomy did not show worse survival. With respect to the microscopic features of the recurrent metastatic disease, a surgical margin, invasions of the portal vein or hepatic vein, and bile duct invasion had no statistically significant influence on survival.
Multivariate Analysis of Survival
Multivariate analysis identified three independent risk factors: synchronous first hepatectomy, four or more lesions at second hepatectomy, and invasion of the portal vein or hepatic vein at first hepatectomy (Table 2
). Any of the variables related to microscopic findingsinformation that could only be obtained after the second hepatectomywere not statistically significant prognostic factors.
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| DISCUSSION |
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Several studies have tried to identify factors predictive of a favorable outcome after repeat hepatectomy. To date, three reports have identified independent prognostic factors by multivariate analysis. Adam et al.6 showed that the disease-free interval between initial and second liver resections and a second liver resection with curative intent were independently associated with survival. In our study, univariate analysis showed that a disease-free interval of more than 6 months between the first hepatectomy and recurrence was a significant prognostic factor, although it did not reach statistical significance by multivariate analysis. Our multivariate analysis showed that synchronous first hepatectomy was an independently predictive factor. Petrowsky et al.18 showed that the presence of multiple lesions at repeat hepatectomy and a maximum tumor size exceeding 5 cm were independent prognostic factors after repeat hepatectomy. The third report, by Yamamoto et al.15 from our hospital in 1999, involved data from 90 repeat hepatectomies (second = 75; third = 12; fourth = 3). Multivariate analysis revealed two independent prognostic factors after the second hepatectomy: four or more tumors, and the presence of extrahepatic disease. The present study detected three independent prognostic factors: synchronous first hepatectomy, four or more lesions evident at the second hepatectomy, and invasions of the portal vein or hepatic vein at the first hepatectomy. Thus, only the number of lesions was a common predictor of outcome, whereas the other factors differed from those highlighted in the first study. We speculate that the reason for this difference was patient selection. In the prior report, 12 of the 75 patients who underwent second hepatectomy had received their first hepatectomy at other hospitals. In the present series, all the patients had undergone both first and second hepatectomies at our hospital. This means that we had full access to pathologic data from both procedures, ruling out any possibility that the first resection had been an incomplete one, and had not been performed at a specialized center such as ours. Okano et al.27 reported that portal vein invasion, hepatic vein invasion, neural invasion, and absence of macroscopic bile duct invasion were prognostic factors for poor outcome in patients undergoing initial hepatectomy. Similarly, we found that histopathologic evidence of invasions of the portal vein or hepatic vein at the first hepatectomy were associated with poor prognosis in patients undergoing a second hepatectomy. To date, to our knowledge, no previous report has indicated that pathological findings other than surgical margin can be predictive of survival after second hepatectomy. It is therefore suggested that not only adequate hepatic resection but also detailed examination by a specialized pathologist is important for more precise selection of patients for second hepatectomy.
All three independent risk factors we found to be important can be recognized before the second hepatectomy, thus permitting a prognosis to be estimated before patients undergo a second hepatectomy. We grouped the patients according to their risk factors. Survival expectancies at 5 years for patients with no risk factors, with one or two, and with three risk factors were 62%, 31%, and 0%, respectively. Considering these results, second hepatectomy will most benefit patients with no risk factors. In addition, no further treatments are needed for those patients. Patients with one or two of these risk factors may require adjuvant therapy after a second hepatectomy to improve survival. There is not much evidence of the efficacy of chemotherapy after hepatectomy, even now. So far, no evidence of improved overall survival has been shown, but the tested regimens included only fluorouracil, floxuridine, and leucovorin, and did not include irinotecan or oxaliplatin.2830 A clinical trial comparing progression-free interval in patients undergoing surgical resection and/or ablation for hepatic metastases from colorectal cancer treated with adjuvant therapy comprising oxaliplatin and capecitabine versus without hepatic arterial infusion of floxuridine was conducted by National Surgical Adjuvant Breast and Bowel Project (NSABP-C09). This year, we are going to start a comparative trial to evaluate the efficacy of adjuvant chemotherapy with oxaliplatin added to the simplified bimonthly 5-FU and leucovorin regimen31 as compared with surgery alone in patients undergoing curative hepatectomy. These results will permit us to determine the strategy to take with patient treatment after hepatectomy.
Generally, neoadjuvant chemotherapy for the patients with hepatic metastases is the strategy for initially unresectable tumors. Adam et al.32 showed the results of neoadjuvant chemotherapy in 701 patients with initially unresectable colorectal liver metastases. Ninety-five cases (13.5%) were found to be resectable, and patients underwent a potentially curative resection with a 5-year survival rate of 35%. Tanaka et al.33 studied neoadjuvant chemotherapy for 48 patients with five or more bilobar hepatic metastases. They found that 25 patients with neoadjuvant chemotherapy had a better 5-year survival rate than 23 patients who did not receive neoadjuvant chemotherapy (39 vs. 21%, P = .039). Multivariate analysis showed that neoadjuvant chemotherapy was an independent predictor of survival. Adam et al.6 have adopted neoadjuvant chemotherapy for recurrent liver metastases before second hepatectomy, except in patients with small and solitary disease without concomitant extrahepatic disease.
Neoadjuvant chemotherapy before hepatectomy carries a risk of missing the opportunity for resection in patients whose tumors are initially resectable if tumor progression subsequently occurs during the course of chemotherapy. On the other hand, immediate resection carries a risk of missing occult metastases in the liver or at other sites. It was pointed out that the risk of missing the opportunity for resection could be avoided by frequent evaluation and the use of effective currently available chemotherapy regimens. Allen et al.,34 in a study of neo-adjuvant chemotherapy for patients with synchronous liver metastases, reported that none of those tumors became unresectable during the course of chemotherapy. Leonard et al.35 commented that the role of neoadjuvant chemotherapy in patients with resectable liver metastases was not confirmed, and well-designed prospective trials were needed. One clinical trial was conducted to evaluate the feasibility and risks of the preoperative chemotherapy with oxaliplatin, 5-FU, and leucovorin and surgery for resectable colorectal liver metastases by the European Organization for Research and Treatment of Cancer.36 The trial had been closed, and the interim results were that 93% of the patients receiving preoperative chemotherapy underwent surgery, and their surgery-related mortality and morbidity were low. The results on survival will be available in 2006. In our institution, the policy for liver metastases is immediate resection when the metastases are found to be resectable, even if they have recurred for the second or third time. For patients with no risk factors, or with one or two of these risk factors, immediate surgery without neoadjuvant chemotherapy is appropriate considering our results. Although we cannot deny that hepatectomy is the best and most potentially curative treatment for recurrent hepatic metastases, neoadjuvant chemotherapy followed by surgery is likely to be preferable for patients who have all three risk factors, to achieve better outcome.
Yamamoto et al.15 showed that the presence of extrahepatic disease was independently associated with poor survival, but because our series included only three patients with concomitant extrahepatic metastases, we were unable to confirm this. All three patients had solitary lung metastasis; one underwent pulmonary resection concomitant with second hepatectomy, and the other two underwent the two procedures synchronously. The first two patients died after 7 and 19 months, respectively, and the third is alive, without recurrence, at 37 months. Thus, we think that the presence of pulmonary metastases does not contraindicate repeat hepatic resection if it is anticipated that surgical resection of lung disease will result in cure.
In conclusion, we have been able to identify three risk factors that predict poor survival in patients with recurrent liver metastases from colorectal cancer: (1) synchronous first hepatectomy, (2) four or more lesions present at the time of second hepatectomy, and (3) invasions of the portal vein or hepatic vein evident at the first hepatectomy. Second hepatectomy is beneficial for patients without any risk factors. Before second hepatectomy, we should consider the use of chemotherapy for patients with any of these risk factorsespecially in patients with two or three factorsin the adjuvant or neoadjuvant setting to prolong survival. These results need to be confirmed and validated with another data set or by future prospective trials according to the scoring scheme we showed.
Received for publication July 2, 2006. Accepted for publication July 3, 2006.
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