Case report: High-volumetric atypical hemihepatectomy in patient with colorectal cancer with extensive metastatic disease

Hepatic metastasectomy in colorectal cancer is becoming a routine procedure, however the presence of extrahepatic metastatic disease worsens the life expectancy. A high-volumetric hepatic resection in case of multiple liver metastases might be performed after iatrogenic liver hypertrophy aimed to enlarge functional liver volume. Ligation or embolization of portal vein can be done. The outcome of the procedure is significantly improved using newest chemotherapy regimens and biological medications. We report a case with successful combined therapy of a 49-year-old male with colorectal cancer and bilateral extended metastatic process in liver and lungs. Correspondence to: Olga Sjomina, Riga East Clinical University Hospital, Riga, Latvia; E-mail: olga_sjomina@inbox.lv


Introduction
Colorectal cancer is the third most common cancer in men and the second in women worldwide with the highest estimated mortality rates in both sexes in Central and Eastern Europe -20.3 per 100,000 for men, 11.7 per 100,000 for women. In Latvia, colorectal cancer is the second most common cancer related cause of death after lung cancer [1]. Typically metastases of colorectal cancer are primarily found in liver due to drainage through the portal system. Up to 25% of patients already have liver metastases at the moment of primary diagnosis and 50 to 70% eventually develop liver metastatic disease during the course of treatment [2,3].
Survival without treatment in metastatic colorectal cancer is poor-approximately 5 to 9 months [4]. Life expectancy might be prolonged by the hepatic resection, which is thought to be the most effective method of therapy, as it is possible to remove up to 80% of hepatic parenchymatous tissue. Prognosis after hepatic metastasectomy improves significantly with median survival up to 46 months, according to multiple meta-analyses data [5].

Clinical case
A 49-year-old male presented with abdominal pain and defecation problems. Colonoscopy examination showed ulcerating tumour 8 cm over the anal opening, histologically-tubular adenoma, CEA -28.4 ng/ ml, CA 19-9 -31.6 U/ml. A week later local and systemic dissemination of process was radiologically diagnosed (Figures 1-3).
In the third segment of the right lung a solitary metastasis was found. Clinical diagnosis was as follows -malignant tumour of rectum cT4N+M1 (lungs, hepatic), stage IV. Oncologic concilium decision was to start neoadjuvant chemotherapy with six FOLFOX courses and three courses of bevacizumab. After neoadjuvant chemotherapy was finished, repeated abdominal CT was performed.
Two months after neoadjuvant chemotherapy was finished, patient received anterior resection of rectum and transmesorectal excision with preventive iliostoma. Adjuvant chemotherapy was ordinated with FOLFOX and bevacizumab. Overall, patient got four FOLFOX and three bevacizumab courses. Following adjuvant chemotherapy, hepatic MRI was performed ( Figure 4). Two months after MRI examination first stage of surgical management of liver metastases was done-atypical resection of Sg 2, Sg 3, Sg 4a and Sg 4b with following right portal vein branch ligation and hepatoduodenal region lymphadenectomy ( Figure 5).
Additionally, cholecystectomy was made during operation. Histologically, malignant cells were found in one of five operation material blocks from liver nodes. After first stage of operation patient received seven FOLFIRI and five bevacizumab courses due to allergic reaction for FOLFOX regimen. Patient continued to be followed-up until the second stage of hepatectomy ( Figure 6).     Intraoperative ultrasonoscopy revealed Sg3 metastasis 7 mm in diameter in the hypertrophied left lobe, but due to critically small residual hepatic tissue volume and long operation period, previously planned radiofrequency ablation of new metastasis in the left lobe was cancelled. Histologically-metastatic nodes in liver with patomorphosis stage IV, malignant cells were not found, resection lines were clean. Patient continued receiving adjuvant chemotherapy with three FOLFIRI and three bevacizumab courses with positive dynamics.
Later, right side thoracotomy was done with the third and eighth segment resection. Histologically, metastatic adenocarcinomatous nature of focuses was confirmed. At that moment, management of primary tumour and metastatic focuses was completed. Overall, two years after diagnosis of rectal malignancy, received neoadjuvant and adjuvant chemotherapy and surgical intervention, patient was considered disease-free with no tumour focuses found in CT and MRI examinations (Figure 8).
Already for two years after combined treatment completion patient is followed-up with CT and colonoscopy (CEA and CA 19-9 in reference range). No data about progression of oncologic process are found at the moment.

Discussion
Earlier metastatic colorectal cancer thought to be incurable disease, however during last decades therapy results improved significantly. Being one of the most common cancer types in the world, it requires rapid improvement of management quality. It is vitally important to use combined therapy even in the late stages of metastatic disease [6].
The liver is the most common localization of metastases, the second place take the lungs-approximately 20% of patients will develop pulmonic metastases. Previously the main way of treatment of metastatic disease was systemic chemotherapy, however newer regimens of chemotherapeutic agents improved the survival; also newer biological medications brightened the prognosis. FOLFOX in combination with bevacizumab appeared to be highly effective in case of metastatic disease in colorectal cancer [6,7]. Liver Pancreat Sci, 2017 doi: 10.15761/LPS.1000110 The morbidity and mortality after hepatic metastasectomia is usually related to progression of liver failure that depends on the resection volume as well as contribution of coexisting liver disease [10][11][12]. Previous researches in this field provide controversial data about the correlation between the volume of damaged hepatic tissue and life expectancy. Sheele et al. claimed that five and more hepatic metastases negatively impact the result of hepatectomy [13]. However, according to the guidelines, there is no significantly proved adverse influence of the amount or localization of hepatic metastases, if the primary tumour could be radically resected [11,14].
Presence of multiple metastases of colorectal cancer in both hepatic lobes requires a resection of significant liver volume to achieve sufficient results [15]. The possible way of high-volumetric resection with sufficient retention of hepatic function is the iatrogenic partial hypertrophy of preserved lobes. The role of vein ligation was proved by previous researches [16]. In our case ligation of right branch of portal vein was performed. However, according to previous studies it is supposed that portal vein embolization has a significantly better prognosis for hypertrophy of left lobes in comparison with ligation, as the ligation provoked formation of portoportal collaterals [17,18]. On the other hand, recent reports proved efficient hypertrophy induced by ligation in two-step hepatectomy [19,20]. Although our patient underwent partial left lobe resection and had a remnant node with impossible ablation, the hypertrophy by ligation was evaluated as sufficient, as well as the function of liver at follow-up period is confirmed to be appropriate.
Earlier is was believed that only in case of absent extrahepatic metastases metastasectomy could have significantly positive effect on life expectancy in patients with colorectal cancer. However, nowadays resectable pulmonary metastases are no longer the contraindication for surgical treatment [6,[21][22][23]. The follow-up period in our case continues, still after two years after last surgery no metastases were detected neither in the liver, nor in the lungs; CEA also says in reference range.

Conclusion
The resection of hepatic metastases is the only method to achieve remission. Nowadays metastasectomy in colorectal cancer is becoming a routine, even if extrahepatic resectable metastases are detected. Significant increase of survival rates is supported by newer neoadjuvant and adjuvant chemotherapy regimens, as well as the use of latter-day biological drugs provide recession of primary tumour and metastatic volume up to full response. Even a high-volumetric metastatic damage of liver tissue in selected patients is successfully tolerated after iatrogenically reached hypertrophy of reserved segments. Nevertheless, embolization of portal vein thought to be more effective, the sufficient result can be reached by the ligation.

Conflict of interests
No conflict of interests was declared.   Positive reaction to primary chemotherapy gives the opportunity to perform metastasectomy with prediction of long-time survival. During the last years hepatic metastasectomy is slowly getting used as routine management. The survival rates of patients with potentially resectable metastases used to be six to twelve months; actual 5-year survival rate for resected patients increased up to 39% [8,9].