Outcome of Laparoscopic Resection for Left Sided Colon and Rectal Cancer

Background: For many years, traditional surgery for left colon and rectal cancers had developed with variable degrees of morbidity. With the evolution of laparoscopy and by the aid of better visualization and magnification, laparoscopic colorectal surgery had appeared, but technically challenging as it involves almost all advanced laparoscopic techniques, with the benefits of minimal morbidity, less pain, earlier recovery, shorter hospital stay, without compromising oncological results. Aim: The aim of this work was to evaluate laparoscopic resection for left sided colon and rectal cancer as regard feasibility, safety and outcomes. Patients and Methods: This prospective study was conducted on 40 patients having left sided colon and rectal cancer, including 29 patients with rectal cancer and 11 patients with left sided colon cancer within the inclusion criteria are evaluated by clinical examination, radiological and colonoscopic study and biopsy and treated by laparoscopic resection and followed ranged from 6 months to 2 years with mean of 20 months. Results: Twenty seven patients (67.5%) underwent laparoscopic anterior resection, 11 patients (27.5%) underwent laparoscopic left hemicolectomy and only 2 patients (5%) underwent laparoscopic abdominoperineal resection, minimal morbidity, no cancer related mortality and no recurrence during the period of follow up either local or systemic. Conclusion: Laparoscopic resection for left sided colon and rectal cancer is technically feasible, oncologically safe and has more benefits on postoperative recovery.

degrees of morbidity [2].Laparoscopic colorectal surgery is technically demanding as it involves almost all advanced laparoscopic skills [3].Colorectal surgeon needs a long time in mastering the advanced laparoscopic skills required in this type of surgery, but the great advantages of laparoscopic colorectal surgery than open surgery overweight this effort [4].The radicality of resection and the oncological results were initially a matter of debate limiting the spread of laparoscopic colorectal surgery [5] [6].A series of studies showed that, in experienced hands, laparoscopic colorectal surgery has a valuable effect on post-operative recovery, compared to open surgery, without compromising the oncological results [7].
The aim of this work was to evaluate laparoscopic resection for left sided colon and rectal cancer as regard feasibility, safety and outcomes.

Patients and Methods
This study was conducted at Gastrointestinal, Liver and Laparoscopic surgery unit, General Surgery Department, Tanta University Hospitals over a period from 1st April 2013 to 31 January 2016 on 40 patients having left sided colon and rectal cancer.
Patients with locally advanced or metastatic lesion, emergency presentation, and patients with history of prior major abdominal surgery causing dense scar tissue, high risk patients for general anesthesia and those with coagulation disorders or hepatic dysfunction (Child-Pugh C) are excluded from this study.
Approval from the ethical committee of our institution was taken, and informed written consent was obtained from all patients after full explanation of the benefits and risks of the procedures and for recording the procedure and inclusion within the study.
Patients were examined thoroughly, laboratory and radiological investigations were done to confirm diagnosis and for proper staging of the disease and also tumor markers screening followed by colonoscopy and biopsy and then undergo standard bowel preparation.
Operative details: Under general anesthesia with endotracheal intubation, a nasogastric tube and a urinary catheter were inserted and digital rectal examination is performed to assess the rectal tumors and to confirm the level and relation to the sphincters, then the abdomen and perineum are prepped and draped.Pneumoperitoneum was initiated as usual and careful exploration of the abdominal cavity including the liver and peritoneal surfaces to exclude tumor dissemination.Splenic flexure mobilization: With the patient in Trendelenburg position starting to the left third of the transverse colon, by the aid of ultrasonic dissector or ligasure the omentum is dissected from the transverse colon and the lesser sac is opened.Dissection (medial to lateral approach): We prefer this approach as it has the advantage of "no-touch" technique and also the persistence off the lateral emberyological attachments to the end of the dissection made it easy.Dissection of the Rectum: The "holly plane" around the rectum and its mesentery is entered ensuring total mesorectal dissection and preserving the hypogastric nerve is a must.
Restoration of the intestinal continuity is prepared extracorporeal ly after extraction of the specimen from a small pfannnestiel incision and done under laparoscopic guidance.
Follow up: All patients were followed up monthly for six months, then every 3 months for the first year and yearly thereafter.Chest and abdominopelvic CT scan were done every 6 months for the detection of local or systemic recurrences A colonoscopy was being obtained at the 1-year visit.(ranged from 6 months to 2 years with a mean of 20 months) (Figures 1-9).For quantitative data, the range, mean and standard deviation were calculated.Significance was adopted at p < 0.05 for interpretation of results of tests of significance (Table 1 & Table 2).

Results
The results were tabulated as follow.
Sixty percent of our cases were of Stage III, 22.5% of Stage II and 17.5 were of stage I according to AJCC staging system (Tables 8-11).

Discussion
For many years laparoscopic surgery have been developed with it known advantages, and widely used as an alternative to open surgery for benign and malignant colorectal diseases [8].Laparoscopic colon resection have established better short-term results, and equivalent oncological outcomes [9].Laparoscopic rectal surgery is developing with promising short-term outcoome, but requires more technical skills [10].
In our work the operations performed were 27 laparoscopic anterior resections, 11 laparoscopic left hemicolectomies and only 2 laparoscopic abdominoperineal resections.no abdominal incision to close [12].
In our study, blood loss ranged from 25 -250 cc with mean 86.87 ± 51.8, with no significant difference in the blood loss between laparoscopic colon and rectal procedures.
While Arezzo et al., 2012 reported in their systematic review and meta-analysis that intraoperative blood loss was significantly less for the laparoscopic group compared to the open group and ranged from 20 ml to 321.7 ml and from 92 ml to 555.6 ml in the laparoscopic and open groups respectively [13].
In our work adverse intraoperative events occurred in 7 cases (17.5%), there was bleeding in 3 cases (7.5%), injury of the gonadal vessels in 2 cases (5%), Injury of colonic wall occurred in one case close to the tumor site(2.5%)and left ureteric injury occurred in one case due to extensive adhesions (2.5%).
In this study postoperative complications occurred in 10 cases (25%), most of them occurred during our early experience.Arezzo  in those who were not defunctioned [16].
In our study, the duration of hospital stay for all procedures ranged from 5 -14 with mean 7.17 ± 1.96 days.This agrees with the KOREAN trial, the mean hospital stay for laparoscopic rectal resections was shown to be 8 days ranging from 7 to 16 days [18].
In our study the duration of analgesia usage ranged from 2 -6 days with mean 3.20 ± 1.14.Sun et al., 2011 showed that laparoscopic colorectal surgery obviously caused significantly less pain for patients [2].
Adequate resection margin and lymphadenectomy is essential for good oncological results [19].
In our study, the tumor size was ranged from 1 -7 cm with median 3.57 ± 1.41 cm and this coincide with the study carried out on the same issue by Veldkamp R, et al (2005): in which the mean size of lesions for the LAP group was 4.4 ± 3.1 cm, and that of the open group was 5.7 ± 2.5 cm.The mean distal margin was 8.32 ± 2.3 cm for colonic lesions while it was 3.22 ± 1.64 cm for rectal lesions.In only two cases of rectal cancers the distal resection margin was less than 2 cm and the histological examination showed free proximal and distal resection margins in all surgical specimens in all patients [20].
In our study, circumferential margin (CRM) was free in all cases of rectal cancer ex-cept one case (3.45%) showed involved or positive CRM which is similar to that concluded by Rostirolla et al., 2016 who found a rate of 5.66% of circumferential margins committed [7].
In our study, the numbers of lymph nodes retrieved ranged from 2 -27 lymph nodes with mean 11.25.00 ± 4.91.lymph node metastases were present in 24 cases (60%).
Twelve lymph nodes should be removed in the surgical specimen for a proper oncological staging [21].
In our work, there was (22.5%)rate of conversion (9 out of 40) and, was associated

Conclusion
Laparoscopic resection for left sided colon and rectal cancer is technically feasible, oncologically safe and has more benefits on postoperative recovery.
Identification of the Inferior Mesenteric Vein (IMV): The IMV is identified at the ligament of Trietz lateral to the fourth part of the duodenum.Division of inferior mesenteric artery (IMA): To ensure an adequate lymphadenectomy, the first 2 cm of the IMA are skeletonized with aid of the right angled dissector before it is divided.Mobilization of the Sigmoid and Descending Colon: The mobilization of the sigmoid colon follows the division of the vessels.This step includes the freeing of posterior and lateral attachments of sigmoid mesenteries.

Figure 1 .
Figure 1.Division of gastrocolic omentum and opening of lesser sac.

Figure 2 .
Figure 2. Identification of IMV lateral to the fourth part of the duodenum.

Figure 4 .
Figure 4. Division of the IMA using ligasure after proximal and distal clipping.

Figure 5 .
Figure 5.The inferior mesenteric vein is divided after proximal clipping.

Figure 6 .
Figure 6.Lateral mobilization of the colon.

Figure 8 .
Figure 8. Division of distal rectum using articulated endo GIA.

Figure 9 .
Figure 9.The anastomosis is then done under laparoscopic guidance.
with prolonged operative time, prolonged duration of analgesia usage, delayed bowel movement, delayed starting of oral intake and prolonged duration of hospital stay in comparison with the non converted cases.It also was common in patients with high BMI.Out of the nine cases of conversion, only two cases were converted to open in the second year of the study due to improvement in the learning curve and stabilization of the operative technique.

Table 2 .
Anatomical distribution of the tumors.

Table 3 .
Mean values of operative time and blood loss.

Table 6 .
Histological differentiation of the tumors.

Table 7 .
Tumor size and resection margins

Table 9 .
Number of lymph nodes retrieved and lymph node metastasis.

Table 10 .
Conversion among the studied patients with left sided colon or rectal cancer (n = 40).

Table 11 .
Anatomical distribution of the tumor among the studied patients with left sided colon or rectal cancer (n = 40).Laparoscopic rectal surgery takes longer duration than its corresponding open surgery in all randomized and comparative trials.The mean surgical time was reported to be between 180 -260 minutes [11].But Araujo et al., 2003 reported significantly shorter operative time with laparoscopic compared to open colorectal surgery (228 min vs 284 min respectively, P = 0.04).Due to cumulative laparoscopic experience and there was et al., 2012 registered surgical complication rate was 16.6% in the laparoscopic group and 19.0 % in the open group.[12].
[23]n et al., 2014 stated that, conversion was required because of local tumor invasion or difficult dissection in a narrow pelvis, bulky tumor, dilated small bowel and dense adhesions[22].Breukink et al., 2006 reported a highly variable rate of conversion ranging from 0%to 33%[15].Ng et al.,2014 had a conversion rate of 30.3% most of them were done early after routine diagnostic laparoscopy[23].