Abstract
Background
Resection of isolated hepatic or pulmonary metastases from colorectal cancer is widely accepted and associated with a 5-year survival rate of 25–40%. The value of aggressive surgical management in patients with both hepatic and pulmonary metastases still remains a controversial area.
Materials and methods
A retrospective review of 1,497 patients with colorectal carcinoma (CRC) was analysed. Of 73 patients identified with resection of CRC and, at some point in time, both liver and lung metastases, 17 patients underwent metastasectomy (resection group). The remaining 56 patients comprised the non-resection group. Primary tumour, hepatic and pulmonary metastases of all patients were surgically treated in our department of surgery, and the results are that of a single institution.
Results
The resection group had a 3-year survival of 77%, a 5-year survival of 55% and a 10-year survival of 18%; median survival was 98 months. The longest overall survival was 136 months; six patients are still alive. In the resection group, overall survival was significantly higher than in the non-resection group (p < 0.01). Independent from the chronology of metastasectomy, 5-year survival was 55% with respect to the primary resection, 28% with respect to the first metastasectomy and 14% with respect to the second metastasectomy. A disease-free interval (>18 months), stage III (UICC) and age (<70 years) were found to be significant prognostic factors for overall survival.
Conclusion
Our report strongly supports aggressive surgical therapy in patients with both hepatic and pulmonary metastases from CRC. Overall survival for surgically treated selected patients with both hepatic and pulmonary metastases from CRC is comparable to hepatic or pulmonary metastasectomy. Simultaneous metastases tend to have a poorer outcome than metachronous metastases.
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Introduction
Second to lung cancer in men and breast cancer in women, colorectal carcinoma (CRC) has increased in incidence over the past 20 years. About half of the patients undergoing radical resection of CRC will develop metastatic disease [1, 2], mostly to the liver (33%) and the lungs (22%) [3]. The overall 5-year survival rate of potentially radical resected CRC has been estimated to 71% [4]. Patients with untreated metastatic CRC have a poor outcome with a 5-year probability of survival of <5% [5]. Conventional management of metastatic CRC has been directed at palliation. But chemotherapy-based treatment regime seldom produced long-term survival in these patients. These disappointing results have led to the general acceptance of surgical treatment of patients with metastatic disease to the liver or to the lung. Nowadays, resection of hepatic metastases has become an effective treatment with a reported 5-year survival of 39% [6]. Likewise, the resection of lung metastases has a 5-year probability of survival ranging from 21% to 43% [7–9]. The discouraging results of chemotherapy along with the encouraging survival rates in resected patients have led to the attempts to expand the indication for surgical treatment of metastatic CRC in patients with metastases both to the liver and to the lung. Several reports from other institutions showed a survival rate of these highly selected patients similar to patients who underwent surgical resection of metastases confined only to the lung [10–12]. However, the results are limited by a small number of patients.
We reviewed the characteristics of our patients with radical (R0) resection in an attempt to evaluate the efficacy of resection of both hepatic and pulmonary metastases.
Materials and methods
A retrospective single-centre data analysis of all patients with R0 resected hepatic and pulmonary metastases of colorectal cancer was performed. The study period ranged from January 1990 to February 2008. All patients with radical (R0) resected CRC and synchronous or metachronous hepatic and pulmonary metastases were included. Selection criteria for resection of the metastatic lesion were a controlled primary tumour and controlled or controllable lesions.
Preoperative staging included coloscopy with histopathological biopsy, endoscopic ultrasound and CT scan of abdomen and chest. Postoperative staging of CRC was classified according to the UICC (Union internationale contre le cancer) guidelines [13]. Surgical data and histopathological findings were evaluated retrospectively. Follow-up data were obtained through a standardised surveillance programme for colorectal cancer including coloscopy, liver ultrasonography, chest radiography and determination of carcinoembryonic antigen (CEA) level. In the case of a suspected lesion or elevated CEA level, further diagnostic imaging (CT scan, PET) was added. Surgery was indicated in all cases of newly detected pulmonary or hepatic lesions.
By definition, metastases occurring within 3 months after resection of the primary tumour were termed synchronous metastases. In contrast, metastases that occurred after a disease-free interval of more than 3 months after primary resection were termed metachronous.
Liver resections were classified as solitary or multiple wedge resections, lobectomy, segmentectomy or hemihepatectomy. Additional hyperthermic or radiofrequency ablation in combination with liver resection was also assessed. Pulmonary resections were classified as wedge resection, segmentectomy or laser ablation. Bilateral lung metastases or recurrent lesions were not a contraindication. The medical records of all patients with pulmonary and hepatic metastases of colorectal cancer were reviewed with regards to age, sex, disease-free interval, mortality, morbidity and survival. Postoperative mortality was defined as any death that occurred within 30 days after either lung or liver resection or during the same period of hospitalisation.
Statistics
Statistical analysis was performed with SPSS 17.0 (SPSS Inc., Chicago, IL, USA). The significance of relations between patient groups and pathological parameters were analysed using Pearson’s chi-square or Fisher’s exact test. Survival analysis was performed using Kaplan–Meier [14] (for univariate analysis) and Cox regression model (multivariable model) with the date of the primary tumour resection as the starting point. Survival curves were compared using the log-rank test. A two-sided p < 0.05 was considered significant.
Results
Between January 1990 and February 2008, a total of 1,497 patients underwent radical (R0) surgical resection of colorectal cancer at the Department of Surgery, University of Schleswig-Holstein, Campus Luebeck. Among these, 177 patients developed metastases confined to the liver (39 synchronous, 138 metachronous), and 68 patients had undergone resection of pulmonary metastases (three synchronous, 65 metachronous).
Seventy-three patients developed both hepatic and pulmonary metastases (17 synchronous, 56 metachronous). Forty-five patients were surgically treated (R0) in the first place. The remaining 27 patients were not surgically treated due to the following reasons: Seven patients had a diffuse metastatic spread of both liver and lung, three had multiple lesions in the liver (one with an additional carcinoma of the colon, ten local recurrences combined with metastases to the liver or the lung and seven patients with simultaneous metastatic occurrence in liver, lung and a third localisation (bone, brain, lymph nodes). These patients were treated by chemotherapy (CTX), radiotherapy (RTX), immunotherapy (ITX) or a combination. They had no surgical treatment at all.
When the tumour occurred in a further, second location, only 17 of these 45 patients could receive radical surgical treatment, whilst in the remaining 28 patients, a non-surgical treatment (radiotherapy, chemotherapy, immunotherapy or any combination) was performed due to reduced general condition or multiloculary recurrence.
Of the highly selected group of patients with both hepato-pulmonary metastases, only a small number of 17 patients with both R0 resected metastases of CRC were identified in our retrospective study (Fig. 1).
Nine of 73 patients had received neoadjuvant treatment (seven patients with combined chemo-radiotherapy, two patients only radiotherapy). Average overall survival (OS) in this group was 56.2 months (SD ± 11.4), median 46.8 months. Two patients were still alive at the end of the study (range 23.1–133.3 months). Adjuvant treatment after colorectal resection was performed in 50 of 73 patients (68.3%). There was no significant improvement of overall survival in patients with adjuvant chemotherapy versus patients with adjuvant chemo-radiotherapy (Table 1).
Fifty-one out of 73 patients underwent adjuvant treatment after metastasectomy (29 chemotherapy, two radiotherapy, 20 chemo-radiotherapy). Adjuvant therapy after first metastasectomy was not observed to improve long-time survival. Additional resection for recurrent disease was performed in two patients; both patients are alive with no evidence of disease (Table 2).
The R0 resection group had a better outcome than the non-resection/one-time resection group (n = 56) with a median survival of 97.8 versus 35.3 months. The difference in survival was found to be significant (p = 0.009; Fig. 2).
There were 11 men and six women, with a mean age of 58 years (range 42–72 years) at the time of primary tumour resection. The primary site of the tumour was the colon in nine patients and the rectum in eight patients. All patients had initial R0 colorectal resection. In 15 patients, the tumour was resected by laparotomy; in two patients, a laparoscopic-assisted resection was performed (Sigma, Coecum).
On initial presentation, three patients had UICC classification stage I disease (18%), two patients stage II (12%), four patients stage III (23%) and eight patients stage IV (47%). Three patients received a neoadjuvant radiochemotherapy before their initial colorectal resection (rectal cancer stages III and IV). Ten patients (59%) had adjuvant 5-FU-based chemotherapy after resection. Adjuvant chemotherapy after colorectal resection was given in seven of our patients (41%). All of them received additional chemotherapy after resection of the first metastases. Two patients with stage II rectal cancer were given neoadjuvant radiochemotherapy; one of them received additional chemotherapy after resection of the primary tumour and after the resection of the metastases as well (Table 3). The overall survival in this patient was only 32 months. No patient had an intraabdominal recurrence. All patients showed a normal colonic endoscopic examination before liver or lung surgery.
Eight patients had synchronous metastases (six liver, two lung) and were all resected within 3 months after primary resection; nine patients developed metachronous metastases.
Median age at the time of liver resection was 74 years (range 46–78 years), and median time from colorectal resection to liver metastases was 1 year (range 0–6 years). There were 14 segmentectomies, four hepatectomies, two liver wedge resections and three additional hyperthermic ablations performed. The average number of liver metastases per resection was 2.5 (range 1–10).
Median time at the age of lung resection was 59 years (range 42–74 years). Median time from colorectal resection to lung metastases was 2.5 years (range 0–6.8 years). Two patients underwent repeat pulmonary resections for recurrent disease.
Fifteen patients underwent thoracotomy for resection of metastases; two patients were resected by thoracoscopy. One segmentectomy, 22 wedge resections and 39 laser resections were performed. The average number of lung metastases per resection was 4.6 (range 1–20; Table 4). After initial metastasectomy, the lung was the site of recurrence (n = 8/72.7%), followed by the liver (n = 3/27.3%).
No postoperative mortality was observed. Follow-up was complete in all patients and ranged from 21 to 136 months, with a median of 54 months. Mean disease-free interval (DFI) after resection of primary tumour was 14.1 months (range 0–72, median 10.8 months). DFI after first metastasectomy was 19.4 months (range 1.3–44.1, median 19.2 months). There was a significant impact of DFI on OS. A disease-free interval longer than 18 months was associated with an OS of 68.2 months (standard error 7.9, 95% confidence interval),whilst patients with a DFI < 18 months after colorectal resection had an OS of 39.3 Monaten (SD 3.6, 95% CI; p = 0.001, log rank; Fig. 3). We also analysed patient survival according to tumour stage (UICC) as determined during surgery for CRC: Patients with stage I disease had a median survival of 98 months, stage II 33 months, stage III 62 months and 59 months in stage IV. Median survival in patients with primary CRC grades 1, 2 and 3 was 62, 47 and 98 months, respectively.
Overall, 3-, 5- and 10-year survival after primary resection for patients with both hepatic and pulmonary metastases (resection group) was 77%, 55% and 18%; median survival was 98 months (Table 5 and Fig. 4). Median OS of patients with R0 resected lung metastases of CRC was 59 months; patients with resected hepatic lesions had a median OS of 47 months. Median survival after first metastatic resection was 47.7 months (range 10.0–117.4 months); median survival after second metastatic resection was 16.3 months (range 2.0–94.5 months; Table 6).
There was no difference in OS for patients with synchronous versus metachronous liver and lung metastases (p = 0.6).
Risk analysis was performed using univariate analysis (chi-square). Table 7 shows survival rates as a function of age, DFI, gender, nodal status, grading and stage of disease: In our data, stage of disease, age and DFI were significant prognostic factors. Multivariate analysis (Cox regression) for >18 months DFI, stage of disease (III/UICC) and age (<70 years) was performed: All of them were found to be independent prognostic factors for an improved overall survival (Table 8).
Discussion
Surgical treatment of hepatic metastases of CRC has been reported with a 5-year survival from 30% to 39% [4, 6, 15, 16], whilst the reported 5-year survival in patients with pulmonary metastasectomy from CRC ranges from 30% to 60% [7–9, 17–20]. In our series, the results of patients with both resection of hepatic and pulmonary metastases were in that range (55%). Yano et al. reported a 5-year survival of 68.6% in seven patients with both hepatic and pulmonary resection, which underlines the necessity of an aggressive surgical approach in these patients [21]. Other authors reported similar results [10–12, 22–25]. Our results with a median survival of 98 months and a 5-year survival of 55% confirm this approach. The apparently improved survival rates for patients with resected hepatic and pulmonary metastases compared to either isolated hepatic or pulmonary metastases are presumably caused by a strict selection of patients and a small number of patients. Multiloculary metastatic disease provides no benefit of survival by nature. Many patients decline metastasectomy following the initial cancer resection for personal reasons. Furthermore, the metastasectomy cannot be offered to a number of patients due to reduced general condition. In our opinion, a lowering of selection criteria will most likely lead to an increase of resections and an assimilation of the survival rates for patients with isolated liver or lung metastases and patients with both liver and lung metastases. Surgical metastasectomy should always be performed if the primary tumour is under control and if the patient has the prospect of complete resection, even in case of a multilocular clinical manifestation. The presence of a systemic spread of disease such as peritoneal carcinosis, pleural carcinosis, hepatic or celiac metastatic lymph nodes is still a contraindication to surgical metastasectomy, whilst the presence of even multiple lung or liver metastases is not a contradiction to surgical treatment. Patients with a solitary metachronous metastases show a benefit in survival [26]. But also simultaneous metastases do not preclude patients from a possible curative resection, and the survival rates in patients with simultaneous metastases are reported with an equal morbidity and outcome as in patients with metachronous metastases [27, 28]. Bilateral or multiple pulmonary metastases or bilateral hepatic lesions are generally accepted for surgical resection when curative resection is possible. Kobayashi et al. reported a significant difference in the cumulative survival for patients with a solitary pulmonary metastasis versus multiple metastases, whereas the number or resected hepatic lesions did not seem to influence outcome [29].
In the current study, patients with a DFI of more than 18 months had a significant impact on OS versus patients with a DFI < 18 months. Sato and colleagues reported similar results in patients with isolated liver metastases of CRC. A prolonged DFI was one of the most important factors for OS [30, 31]. Other prognostic variables such as CEA level or number of lesions are also known to affect survival, but none of them is generally accepted to be an absolute contraindication for surgical resection. Headrick et al. [32] reported the presence of lymph node metastases within the chest as one possible contraindication. They identified four patients in their series with positive thoracic lymph nodes who demonstrated a short DFI and a limited survival. These results were trend-setting but not statistically significant.
The surgical approach was also discussed with regards to affecting survival. For primary tumour resection, we performed a standard laparotomy in 15 patients; in two patients, we performed a laparoscopic-assisted colectomy. The method of resection of hepatic and pulmonary metastases in our patients did not influence the outcome. We used an anterolateral thoracotomy as the standard approach in most of our patients. In those patients with a single pulmonary lesion, we used video-assisted thoracoscopic surgery. One patient with multiple lesions (n = 20) was treated with laser ablation at the time of thoracotomy. The standard approach for hepatic metastases was a median laparotomy in all patients. The surgical approach did not appear to influence patient outcome. Other authors have reported similar results [33, 34].
For patients with stage III colon cancer, adjuvant chemotherapy is widely accepted, whereas in stage II disease, no significant benefit is reported [35, 36]. Adjuvant chemo-radiotherapy for rectal cancer is indicated in stage II or stage III and in patients where radical (R0) resection could not have been reached [37]. Whilst the value of adjuvant therapy of CRC after initial resection is clear, the value of adjuvant therapy after metastasectomy of CRC is not clarified at all. In four international studies, recruiting more than 3,300 patients with resected hepatic metastases of CRC, no significant benefit of an adjuvant therapy after metastasectomy could be detected. The 5-year survival rate after resection of hepatic metastases of CRC was 28–39% irrespective of any adjuvant therapy [38, 39]. In the world literature, there is no evidence of a prolonged survival for adjuvant chemotherapy following pulmonary metastasectomy of CRC [40]. Adjuvant chemotherapy after lung resection is therefore not recommended as a standardised therapy should only take place within controlled studies. Patients treated with adjuvant chemotherapy both after primary resection and metastasectomy had a mean survival of 76.6 months, whilst patients without adjuvant therapy achieved a mean survival of 58.7 months. In our series, the OS for patients with adjuvant chemotherapy after metastasectomy was not significantly improved. Besides, a substantial comparison of the (neo)-adjuvant therapy is neither possible nor meaningful due to the long investigation period (18 years). New chemotherapeutic substances, changing application doses, modified therapy patterns or combination therapies do not permit a comparative conclusion. Repeated metastasectomy for recurrent hepatic or pulmonary metastases has been carried out with no increase in either morbidity or mortality. Repeat metastasectomy by laparotomy or thoracotomy will be offered to any selected patient who can tolerate further resection.
Due to its nature, this retrospective study cannot provide evidence for an advantage of surgical treatment over non-surgical treatment in multiloculary metastatic colorectal cancer. Furthermore, the patient population is limited by high selection. However, the excellent survival rates for selected patients achieved by aggressive surgical therapy adduce empirical evidence bearing comparison with non-surgical treatment. But a prospective study comparing surgical treatment of metastatic CRC versus non-surgical treatment is ethically not feasible since—according to oncological guidelines—all patients with resectable liver or lung metastases of CRC (as the first metastases) should be resected. Lung or liver resection is still the only curative treatment for selected patients with metastatic CRC. The long-term survival in our selected group of patients with both resected liver and lung metastases from CRC is comparable to solitary liver or lung metastases. From a surgical point of view, every attempt must be made to increase the availability of any liver or lung resection [41].
Today, the treatment of metastatic colorectal cancer should be performed in a multidisciplinary way, including surgeons, medical oncologists and radiotherapists.
Surgical treatment of even multiple hepatic and pulmonary metastases of colorectal cancer results in significantly increased survival time compared with patients without a surgical approach. In association with new effective chemotherapies, including immunoglobulin monoclonal antibodies, even long-term survival can be achieved.
Conclusion
Patients with synchronous or metachronous hepatic and pulmonary metastases of colorectal carcinoma should always be considered for a possible surgical resection as it offers a valid therapeutic opportunity with excellent survival rates. An aggressive surgical approach in a specialised centre is safe with low morbidity and low mortality and offers an excellent chance for long-term survival. Overall survival for surgically treated selected patients with both hepatic and pulmonary metastases from CRC is comparable to hepatic or pulmonary metastasectomy.
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This paper was presented at the 126th Annual Meeting of the German Society of Surgery, Munich, Germany, April 28th–May 1st, 2009.
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Limmer, S., Oevermann, E., Killaitis, C. et al. Sequential surgical resection of hepatic and pulmonary metastases from colorectal cancer. Langenbecks Arch Surg 395, 1129–1138 (2010). https://doi.org/10.1007/s00423-010-0595-4
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DOI: https://doi.org/10.1007/s00423-010-0595-4