Department of Surgery, Soonchunhyang University College of Medicine, South Korea
Received Date: June 19, 2017; Accepted Date: July 03, 2017; Published Date: July 07, 2017
Citation: Jang SW, Lim DR, Kuk JC, Kim TH, Shin EJ (2017) Short-Term and Long-Term Outcomes of Complete Mesocolic Excision with Central Vascular Ligation for Ascending Colon Cancer: Single Institution. Surgery Curr Res 7: 299. doi: 10.4172/2161-1076.1000299
Copyright: © 2017 Jang SW, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Purpose: The aim of the present study was to analyze the peri- and post-operative and oncologic outcomes for ascending colon cancer after complete mesocolic excision (CME) with central vessel ligation (CVL).
Materials and methods: The data of 156 patients who underwent CME with CVL for ascending colon cancer between January 2000 and December 2011 were retrieved from a prospective database.
Results: The median follow-up time was 63.6 months. The mean operation time was 191.6 min. The mean blood loss was 85.6 ml. The mean length of the hospital stay was 13.9 days. The mean number of total harvested lymph nodes was 30.3. A 5-year cancer-specific survival (CSS) rate was seen in 83.0% of patients, and a 5-year diseasefree survival (DFS) rate was seen in 79.7%. In stage I, the DFS and CSS rates were both 100%. In stage II, the DFS rate was 91.0% and the CSS rate was 92.3%. In stage III, the DFS rate was 53.5% and the CSS rate was 59.5%. In stage IIIa, the DFS and CSS rates were both 100%. In stage IIIb, the DFS rate was 70.1% and the CSS rate was 92.1%. In stage IIIc, the DFS rate was 19.4% and the CSS rate was 44.0% (p<0.01). The local recurrence rate was 3.8%.
Conclusion: Based on the present data, CME with CVL is feasible and safe for treating ascending colon cancer. CME with CVL could lead to better oncologic outcomes for ascending colon cancer surgery.
Ascending colon; Neoplasm; Surgery
Colorectal cancer is the third most commonly diagnosed cancer in males worldwideand the second most commonly diagnosed cancer in females, with an estimated 1.4 million cases and 693,900 deaths occurring in 2012 . Surgery is the treatment of choice for colorectal cancer . The concept of total mesorectal excision (TME) provides a surgical plane of dissection and improved oncological outcomes for the treatment of rectal cancer [3-5]. In TME, the mesorectal plane is dissected to produce an intact fascial-lined specimen, which contains blood vessels, lymphatic vessels, and lymph nodes . The concept of complete mesocolic excision (CME) provides a correct surgical anatomical plane for the treatment of colon cancer. In CME, the fascial space of the posterior lobe of the mesocolon is completely dissected to separate the fusion fascia from the visceral fascia and the parietal fascia up to the radix of the mesocolon [6-8]. Central vessel ligation (CVL) of the blood vessel supply to the mesocolon at the root occurs as a result of CME. CVL provides improved oncologic outcomes. In CVL, the lymph node is extensively dissected along the supply vessels [9,10]. Some studies reported that CME with CVL provides an increased lymph node harvest, decreased peri-operative morbidity, reduced locoregional recurrence, and improved oncologic outcomes [11,12]. The aim of the present study was to analyze the peri- and post-operative and long-term oncologic outcomes for ascending colon cancer after CME with CVL.
Patients (n=156) who underwent CME with CVL for ascending colon adenocarcinoma between January 2000 and December 2011 were identified from a prospective database. Patients with proximal transverse colon cancer and patients who underwent multivisceral resection were excluded from the present study. Patient of stage IV were excluded from the present study. Patients were also excluded if they had synchronous, multiple, or metachronous colon cancer or hereditary colon cancer (i.e., familial adenomatous polyposis or hereditary nonpolyposis colorectal cancer). The data of all the clinical and pathological features were reviewed retrospectively. After surgery, all patients with stage II or III cancer were recommended adjuvant chemotherapy, as recommended by the National Comprehensive Cancer Network guidelines . Adjuvant chemotherapy includes the use of fluoropyrimidine (i.e., fluorouracil with folinic acid and capecitabine) alone or in combination with oxaliplatin (FOLFOX). All patients underwent a colonoscopy, a biopsy, staging scans (i.e., CT scans of the chest, abdomen, and pelvis), and, occasionally, PET scans. The patients received full bowel preparation and a single shot of prophylactic antibiotics. Some reasons for not recommending, using, or continuing adjuvant chemotherapy included older ages, patient refusal, and adverse side effects. The patients received close follow-ups every 3-6 months up to 5 years after surgery, and the results of the follow-ups were recorded in a database until May 2016 or until death. Disease-free survival (DFS) was defined as the state between the date of surgery and the date of the detection of recurrence, the last follow-up, or death.
The mesenteric root up to the superior mesenteric pedicle is mobilized; dissection continues over the duodenum and the pancreatic uncinate process to allow for complete access to the superior mesenteric vein and to the medially and inferiorly located superior mesenteric artery. Duodenal kocherization is not performed routinely in present study. The ileocolic vessels and the right colic vessels are divided from the superior mesenteric vessels at their origin ; then, the ileocolic vessels are separated from the superior mesenteric artery and vein. After, ligation of the ileocolic vessels is performed, and a lateral or medial approach to shape dissection is performed along Toldt’s fascia. The dissection continues medially on the mesofascial interface; then, the small intestinal mesentery, ileocecal junction, right colon, right mesocolon, and mesenteric confluence are fully mobilized from the underlying fascia and retroperitoneum and left entirely intact  (Figure 1).
Figure 1: Complete mesocolic excision with central vessels ligation: A) 2nd portion of duodenum, B) head of pancrease, C) kidney, D) superior mesenteric vein, E) ligated ileocolic artery and vein at root along with superior mesenteric vein, F) ligated right branch of middle colic artery and vein at root.
All statistical analyses were performed using SAS Version 9.1.3 (SAS Institute Inc., Cary, NC, USA) and IBM SPSS Version 24.0 (IBM, Armonk, NY, USA). The categorical variables were analyzed using the χ2 or Fisher’s exact test, and the continuous variables were analyzed using the student’s t-test or the Mann–Whitney U test. Cumulative incidence methods were used to estimate the rate of cancer recurrence. The overall survival and DFS rates were analyzed using the Kaplan– Meier method, and a comparison of these rates was performed using the log-rank test. P values of less than 0.05 were considered statistically significant. The differences in the overall survival and DFS rates were assessed using the log-rank test. A multivariate analysis of the DFS rates was performed using Cox regression.
All patients (n=156) underwent an elective CME with CVL for ascending colon cancer. The mean age of the patients was 62.7 ± 12.6 years. Of the 156 patients, 78 (50.0%) were male and 78 (50.0%) were female. The mean weight of the patients was 59.6 ± 10.5 kg and the mean height of the patients was 159.5 ± 9.5 cm. The mean body mass index scores of the patients was 23.5 ± 3.4 kg/m2. In terms of the tumor location, cecal cancer occurred in 47 (30.1%) patients, mid- ascending colon cancer occurred in 80 (51.3%) patients, and hepatic flexure cancer occurred in 29 (18.6%) patients. Only 10 patients (6.0%) had a history of previous abdominal operations. In total, 116 (74.4%) patients received adjuvant chemotherapy and 40 (25.6%) did not. Open right hemicolectomy was performed in 137 (87.8%) patients and laparoscopy-assisted right hemicolectomy was performed in 19 (12.2%) patients. The mean initial CEA level of the patients was 22.7 ± 79.8 ng/ ml (Table 1).
|*CME with CVL (n=156)|
|Age(mean ± SD, (range))(year)||62.7±12.6 (28-85)|
|BMI (mean ± SD, (range))(kg/m2)||23.5±3.4 (16.7-33.7)|
|ASA score, n (%)|
|Previous operation history||10 (6.0%)|
|Initial CEA(mean ± SD, (range)) (ng/ml)||22.7±79.8(0.1-550)|
Note: *CME: Complete Mesocolic Excision, CVL: Central Vascular Ligation
Table 1: Patients characteristics.
The pT, pN, pM, and tumor (T), node (N), and metastasis stages are outlined in Table 2. The mean number of harvested lymph nodes was 30.3 ± 16.9. The mean proximal resection margin was 13.4 ± 6.8 cm, and the mean distal resection margin was 18.3 ± 9.9 cm. Of the patients, 3 (1.9%) were in stage 0; 30 (19.2%) were in stage I; 66 (42.3%) were in stage IIa; 4 (2.6%) were in stage IIb; 1 (0.6%) was in stage IIc; 5 (3.2%) were in stage IIIa; 29 (18.6%) were in stage IIIb; 17 (10.9%) were in stage IIIc. Of the T stages, 3 (1.9%) patients were in tis; 23 (14.7%) patients were in T1; 13 (8.3%) patients were in T2; 104 (66.7%) patients were in T3; 10 (6.4%) patients were inT4a; and 3 (1.9%) patients were in T4b. Of the N stages, 104 (66.7%) patients were in N0; 13 (8.3%) patients were in N1a; 14 (8.9%) patients were in N1b; 7 (4.5%) patients were in N2a; and 18 (11.5%) patients were in N2b. Of the patients, 28 (17.9%) had well-differentiated cancer cells, 92 (59.0%) had moderately differentiated cancer cells, and 20 (12.9%) had poorly differentiated cancer cells. In total, 14 (8.9%) patients had mucinous cancer and 2 (1.3%) had signet ring cell cancer. Overall, 58 (37.2%) patients experienced lymphovascular invasion and 98 (62.8%) did not. The mean proximal resection margin was 13.4 ± 6.8 cm and the mean distal resection margin was 18.3 ± 9.9 cm. The mean tumor size was 5.7 ± 3.1 cm (Table 2).
|*CME with CVL (n=156)|
|TNM stage, no. (%)|
|T stage, no. (%)|
|N stage, no. (%)|
|Grade of differentiation, no. (%)|
|Signet-ring cell||2 (1.3%)|
|Harvested no. of lymph nodes, (mean ± SD, range), (No)||30.3±16.9 (1-94)|
|Lymphovasular invasion, no. (%)|
|*PRM, (mean ± SD, range), (cm)||13.4±6.8 (2.8-35)|
|*DRM, (mean(mean ± SD, range), (cm)||18.3±9.9 (1.5-59)|
|Mass size, (cm)||5.7±3.1 (0.5-18.0)|
Note: *CME: Complete Mesocolic Excision, CVL: Central Vascular Ligation, PRM: Proximal Resection Margin, DRM: Distal Resection Margin
Table 2: Postoperative pathologic outcomes.
Peri- and post-operative outcomes after CME with CVL
The mean operation time of the patients was 191.6 ± 55.9 min. The mean blood loss was 85.6 ± 120.3 ml. The mean hospital stay was 13.9 ± 6.1 days. The mean time to partaking in sips of water was 4.7 ± 2.1 days. The mean time to partaking in a liquid diet was 6.3 ± 2.0 days. The mean time to partaking in a soft diet was 7.7 ± 2.7 days. Total number of postoperative complications was in 36 patients (23.1%). Pulmonary problem (atelectasis, pneumonia, effusion) occurred in 3 (1.9%) patients. Ileus/obstruction occurred in 15 (9.6%) patients, and wound infection/dehiscence occurred in 13 (8.3%). Postoperative bleeding occurred in 1 (0.6%) patient. Inta-abdominal abscess occurred in 2 (1.3%) patients. Chyle drainage was in 2 (1.3%) patients. Anastomosis site leakage was no occurred. Post-operative mortality within 30 days occurred in 1 (0.6%) patients due to postoperative massive bleeding at postoperative 4 days (Table 3).
|*CME with CVL (n=156)|
|Operation time, (min)||191.6±55.9 (100-390)|
|Blood loss, (ml)||85.6±120.3 (50-800)|
|Length of Hospital stay, (day)||13.9±6.1 (4-44)|
|Time to Sips, (day)||4.7±2.1 (1-16)|
|Time to Liquid diet, (day)||6.3±2.0 (3-19)|
|Time to Soft diet, (day)||7.7±2.7 (4-29)|
|Total number of complications||36 (23.1%)|
|Wound infection/dehiscence||13 (8.3%)|
|Postoperative bleeding||1 (0.6%)|
|Intra-abdominal abscess||2 (1.3%)|
|Chyle drainage||2 (1.3%)|
|Anastomosis site leakage||0 (0.0%)|
Note: *CME: Complete Mesocolic Excision, CVL: Central Vascular Ligation
Table 3: Peri/postoperative outcomes after *CME with CVL.
The mean follow-up period was 63.6 months. The 5-year DFS rate was 79.7% and the 5-year cancer-specific survival (CSS) rate was 83.0% (Figure 2). In stage I, the DFS and CSS rates were both 100%. In stage II, the DFS rate was 91.0% and the CSS rate was 92.3%.In stage III, the DFS rate was 53.5% and the CSS rate was 59.5%. In stage IIIa, the DFS and CSS rates were both 100%. In stage IIIb, the DFS rate was 70.1% and the CSS rate was 92.1%. In stage IIIc, the DFS rate was19.4% and the CSS rate was 44.0% (p<0.01) (Figures 3 and 4).
Recurrence after CME with CVL
The total number of patients who experienced recurrence was 30 (19.2%). During the follow-up period, systemic recurrence occurred in 24 (15.4%) patients and local recurrence occurred in 6 (3.8%). Of the patients, 6 (3.8%) experienced recurrence in the lung; 3 (1.9%) experienced recurrence in the liver; 6 (3.8%) experienced recurrence in the paraaortic node; 1 (0.6%) experienced recurrence in the bone; and 7 (4.5%) experienced recurrence in the peritoneum. In terms of local recurrence, 2 (1.3%) patients experienced recurrence in the uterus; 1 (0.6%) patient experienced recurrence in the ovary; 1 (0.6%) patient experienced recurrence in the mesenteric lymph node; and 2 (1.3%) patients experienced recurrence in the retroperitoneal lymph node (Table 4).
|*CME with CVL (n=156)|
|Systemic recurrence||24 (15.4%)|
|Paraaortic node||6 (3.8%)|
|Local recurrence||6 (3.8%)|
|Mesenteric lymph node||1 (0.6%)|
|Retroperitoneal lymph node||2 (1.3%)|
|Total Number of Recurrence||30 (19.2%)|
Note: *CME: Complete Mesocolic Excision, CVL: Central Vascular Ligation
Table 4: Recurrence patterns after *CME with CVL.
Prognostic factors of survival after CME with CVL
In a univariate analysis of the factors affecting survival after CME with CVL for ascending colon cancer, initial CEA level (p=0.002), Stage IIIc (p=0.001), nodal status (N1-2 vs. N0; P < 0.005, N1 vs. N2; p<0.005), histological grade (p<0.005) and lymphovascular invasion (p<0.005) were analyzed. However, histological grade was the only factor found to affect survival, according to the multivariate analysis (p=0.026) (Table 5).
|Factors||Univariate analysis||Multivariate analysis|
|HR||95% CI||P-value||HR||95% CI||P-value|
|Age, years (<60 vs. ≥ 60)||0.6||0.26-1.42||0.233|
|Sex (Male vs. Female)||1.28||0.61-2.69||0.517|
|BMI (<25 vs. ≥ 25)||0.98||0.45-2.18||0.968|
|Tumor location (Cecum vs. Ascending)||0.93||0.54-1.59||0.802|
|Tumor location (Ascending vs. Hepatic flexure)||1.37||0.21-1.47||0.242|
|Adjuvant Chemotherapy (Yes vs. No)||3.23||0.77-1.36||0.07|
|Operation method (Open vs. Laparoscopy)||2.68||0.04-1.98||0.109|
|CEA (< 5 vs. ≥ 5)||3.2||1.48-6.95||0.002||2.26||0.94-5.39||0.067|
|Stage (IIIaandIIIb vs. IIIc)||4.46||2.76-7.21||0.001||0.07||0.16-3.69||0.075|
|Tumor invasion (T4a-b vs. T3)||1.59||0.93-2.73||0.06||1.88||0.15-23.79||0.624|
|Lymph node metastasis||0.23||0.26-20.01||0.269|
|(N1-2 vs. N0)||0.13||0.51-0.31||0||0.06||0.02-1.61||0.092|
|(N1 vs. N2)||3.93||2.47-6.26||0||0.23||0.26-20.01||0.269|
|Number of harvested lymph node (12 ≤ vs. > 12)||0.97||0.34-2.81||0.961|
|Histological grade(Well-mod vs. others)||7.39||3.39-16.04||0||2.84||1.14-7.11||0.026|
|Lymphovascular invasion (Present vs. absent)||6.53||1.97-21.64||0||0.25||0.35-1.87||0.619|
Note: *CME: Complete Mesocolic Excision, CVL: Central Vascular Ligation, BMI: Body mass index, CEA: Carcinoembryonic antigen
Table 5: Univariate and multivariate analysis for prognostic factors of survival after *CME with CVL for ascending colon cancer.
Both visceral and parietal peritoneal layers are dissected in CME. It is important to recognize that these two layers are not limited to the pelvis but cover the entire colon as a peritoneal and retroperitoneal envelope [15,16]. The colon is surrounded by the visceral fascia and its mesocolon, including its vessels and lymphatics; therefore, there is no lymphatic flow into the tissues of mesocolon . During the en bloc resection of the colon, the fascial space in the posterior lobe of the mesocolon is completely dissected to separate the fusion fascia from the visceral fascia and the parietal fascia up to the radix of the mesocolon. The concept of and procedure for CME was initially proposed by Hohenberger et al. [6,7]. Japanese D3 dissection is based on similar methods as CME, and both techniques are oncologically superior to methods proposed by studies recently in other countries . The surgical techniques of CME with CVL used in the present study were somewhat different from CME as initially described by Hohenberger et al. . First, the kocherization of the duodenum was not performed routinely. Second, if tumor was not located in the hepatic flexure or the proximal transverse colon, only vessel ligation of the right side of the middle colic vessel was performed without whole ligation of middle colic vessel totally. However, most of the surgical techniques and concepts used in present study were the same as those originally described by Hohenberger et al. .
Several previous studies reported that the rate of post-operative morbidity after CME ranges from 5.7–19.7% [6,11,18-20]. In the present study, the total post-operative complication rate was found to be 23.1%. The most commonly occurring complications were found to be ileus and wound dehiscence. The mean operation time of CME in previous studies ranged from 136–269 min, and no significant differences were reported between open and laparoscopic surgeries [21,22]. The mean operation time in the present study was found to191.6min. The means of the length of hospital stay (13.9 days), time to sips of water (4.7 days), time to soft diet (7.7 days), and blood loss (85.6 ml) in the present study were similar to those reported in previous studies [18-21]. Specimens were collected most often from the correct anatomical plane in colon cancer resection (92% vs. 40%, p<0.0001) and had a higher number of harvested lymph nodes (30 vs. 18, p<0.0001) than non-CME specimens . Several studies reported that the mean number of harvested lymph nodes in CME with CVL for right colon cancer ranged from 28–35.4 for open CME and 19–34.4 for laparoscopic CME [21-24]. The mean number of harvested lymph nodes in the present study was 30.3.
In the present study, the 5-year DFS rate was 79.7% and the 5-year CSS rate was 83.0% with a mean follow-up of 63.6 months. The local recurrence rate was 3.8%. In a systematic review of 5,246 patients with right colon cancer, the 5-year DFS rate was 77.4% and the 5-year overall survival rate was 58.1% with a mean follow-up of 60 months. The local recurrence rate was 4.5% . In the same review , the CME group saw more advantageous oncologic outcomes compared to the non-CME group. It is possible that the improved outcomes of CME patients are related to the resection plane and the vessel site of ligation . The present study also analyzed the long-term oncologic outcomes according to the stages outlined by the 7th Edition of the American Joint Committee on Cancer. Oncologic outcomes rapidly reduced for patients in stage III compared to those in stage I or II. The oncologic outcomes for patients in stage IIIc (19.4%, 44.0%) were significantly lower compared to those in stage IIIa (100%, 70.1%) or IIIb (70.1%, 92.1%) (p<0.01). The T stage was not found to be factors affecting survival according to the univariate and multivariate analyses conducted in the present study. However, N stage was found to be prognostic factor affecting survival according to the univariate analysis [27,28].
The rate of laparoscopic surgeries performed to treat ascending colon cancer increased by 11.3% until 2011, according to the findings of the present study, and gradually increase every year. A multicenter trial (COST trial) reported that the outcomes of open and laparoscopic surgeries for colon cancer are not significantly different in terms of their 5-year overall survival rates (open: 74.6% vs. laparoscopic: 76.4%, p=0.93) and DFS rates (open: 68.4% vs. laparoscopic: 69.2%, p=0.94). Their local recurrence rates are also similar (open: 2.6% vs. laparoscopic: 2.3%, p=0.79) The MRC CLASICC trial reported similar findings in terms of their 5-year overall survival rates (open: 62.7% vs. laparoscopic: 55.7%, p=0.253) and DFS rates (open: 64.0% vs. laparoscopic: 57.6%, p=0.399). Based on the data presented in this study, CME with CVL is feasible and safe for treating ascending colon cancer. Although the present study had certain limitations, like its small study population, the fact that it was a retrospective study, and the fact that the study population only included patients from a single center, CME with CVL was found to lead to better oncologic outcomes for ascending colon cancer surgery.
No potential conflicts of interest relevant to the present study are reported.