Radiology and Oncology | Ljubljana | Slovenia | www.radioloncol.com Radiol Oncol 2021 doi: 10.2478/raon-2021-0026 1 research article Robotic versus laparoscopic surgery for colorectal cancer: a case-control study Jan Grosek 1,2 , Jurij Ales Kosir 1 , Primoz Sever 1 , Vanja Erculj 3 , Ales Tomazic 1,2 1 Department of Abdominal Surgery, Ljubljana University Medical Center, Ljubljana, Slovenia 2 Medical Faculty, University of Ljubljana, Ljubljana, Slovenia 3 Faculty of Criminal Justice and Security, University of Maribor, Ljubljana, Slovenia Radiol Oncol 2021 Received 29 January 2020 Accepted 20 April 2021 Correspondence to: Prof. Aleš Tomaži č, M.D., Ph.D., Department of Abdominal Surgery, Ljubljana University Medical Center, Zaloška cesta 7, SI-1000 Ljubljana, Slovenia; E-mail: ales.tomazic@kclj.si Disclosure: No potential conflicts of interest were disclosed. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Background. Robotic resections represent a novel approach to treatment of colorectal cancer. The aim of our study was to critically assess the implementation of robotic colorectal surgical program at our institution and to compare it to the established laparoscopically assisted surgery. Patients and methods. A retrospective case-control study was designed to compare outcomes of consecutively operated patients who underwent elective laparoscopic or robotic colorectal resections at a tertiary academic centre from 2019 to 2020. The associations between patient characteristics, type of operation, operation duration, conversions, duration of hospitalization, complications and number of harvested lymph nodes were assessed by using univariate logistic regression analysis. Results. A total of 83 operations met inclusion criteria, 46 robotic and 37 laparoscopic resections, respectively. The groups were comparable regarding the patient and operative characteristics. The operative time was longer in the robotic group (p < 0.001), with fewer conversions to open surgery (p = 0.004), with less patients in need of transfusions (p = 0.004) and lower reoperation rate (p = 0.026). There was no significant difference between the length of stay (p = 0.17), the number of harvested lymph nodes (p = 0.24) and the overall complications (p = 0.58). Conclusions. The short-term results of robotic colorectal resections were comparable to the laparoscopically as- sisted operations with fewer conversions to open surgery, fewer blood transfusions and lower reoperation rate in the robotic group. Key words: robotic surgery; laparoscopic surgery; minimally invasive surgery; colorectal cancer Introduction Surgical resection is still the main treatment mo- dality for resectable colorectal cancer. Advances in surgery have allowed the widespread use of mini- mally invasive surgical techniques, which are rep- resented by laparoscopic and robotic approaches as opposed to open approach. Laparoscopic colorectal resections (LCR) are safe and offer patients better short-term results as open surgery with less postoperative pain, faster recovery, shorter hospitalization and better cosme- sis. Furthermore, they are oncologically equivalent to open surgery, as evidenced by multiple rand- omized studies. 1-3 There is even some evidence that LCR result in better median overall survival for patients with stage II colon cancer, older than 75 years, when compared to open surgery. 4 Robotic surgical systems were designed to over- come the limitations of laparoscopic surgery, of- fering better visualization with three-dimensional magnified view and stable camera platform, stabi- lization of tremors and greater dexterity of move- ments. Moreover, they also improve the ergonom- Radiol Oncol 2021 Grosek J et al. / Robotic versus laparoscopic surgery for colorectal cancer 2 ics, possibly reducing fatigue of the operating sur- geon. 5 Key drawbacks include loss of haptic con- trol, longer operative time and above all, increased financial costs. Shortly after the introduction of robotic platforms, surgeons have begun to utilize robotic surgery for management of colorectal diseases and the num- ber of procedures performed annually has stead- ily increased. 6 The evolution and usage of robotic platform is well illustrated by bibliometric data, as more and more manuscripts are being published each year, from feasibility studies to case series and reviews, and, finally, more and more multi-centre trials. The abundance of published research clearly shows, how robotic assisted surgery has gained ac- ceptance not only in the field of colorectal surgery, but across many surgical specialities. 7 However, most of the studies have not demonstrated a major advantage of robotic colorectal resections (RCR) in comparison to laparoscopic resections. 8 Some stud- ies have shown a benefit of the robotic approach with fewer conversions. 9 The ROLARR study has also shown this for the difficult rectal resections in- volving obese men with low rectal cancers. 10 To evaluate the implementation of robotic plat- form at a tertiary medical centre we designed a ret- rospective case-control study to compare outcomes of patients who underwent elective laparoscopic or robotic colorectal resections. Patients and methods Patients A retrospective review of patients that underwent either robotic or laparoscopic surgery for colo- rectal carcinoma was performed. Patients in both groups were consecutively operated in a two-year period; in 2019 (laparoscopic group) and 2020 (ro- botic group). All the operations were performed by a two-member surgical team. The data source was a prospectively maintained database in a single academic institution with previous history of per- forming laparoscopic assisted surgeries for many years. 11,12 Approval for the study was obtained from the Medical Ethics Committee of the Republic of Slovenia. A total of 83 patients were identified and includ- ed in the study; of these, 46 underwent robotic and 37 laparoscopic resections, respectively. The inclu- sion criteria were as follows: histologically proven adenocarcinoma of colon or upper rectum (> 10 cm from the anal verge); no previous or concurrent malignancy at other site; no evidence of distant metastasis at the time of the surgery; minimally invasive (i.e., laparoscopic, or robotic) operation. Patients with low or middle rectal cancer and those presenting as acute emergent cases (i.e., perfora- tion, obstruction) were excluded from the study. Preoperative (age, sex, body mass index [BMI], American Society of Anaesthesiologists [ASA] score and tumour location), intraoperative (op- erative time, conversion rate) and postoperative complications according to the Clavien-Dindo (CD) classification, number of all harvested lymph nodes (LN) and number of positive LN, length of hospital stay and pathologic stage according to the 8 th edition of the American Joint Committee on Cancer [AJCC]-TNM classification, reoperation and mortality rates were reviewed. 13,14 The prima- ry outcomes were conversion rates and hospital length of stay. Secondary outcomes were operative time, postoperative morbidity, and number of har- vested lymph nodes. Surgical technique All operations were performed by a two-member surgical team. Both surgeons were highly experi- enced in open and laparoscopic colorectal surgery and underwent thorough training with proctor- ship before starting the robotic colorectal program. Early in 2020 we started a robotic abdominal program, focusing at first on colorectal resections, both for benign and malignant diseases. As safety and feasibility of robotic colorectal surgery (RCS) are well established, most of currently published data focuses on evaluating perioperative data, comparing it to its laparoscopic counterpart. 15 Patients in both groups underwent identical, standard preoperative workup and preparation, according to our institutional practice. This in- cluded full colonoscopy (partial in case of obstruc- tive carcinoma) and contrast-enhanced computed tomography (CT) of the chest and the abdomen. Full mechanical bowel preparation was employed as per standard for all left sided lesions, while en- ema alone was employed for all right sided and for completely obstructive left sided lesions as well, respectively. Preoperative intravenous antibiotics were given to cover intestinal flora. Patients were secured on a special no-slip foam in a modified lithotomy position for left-sided colectomies and rectal resections, while for right colectomies legs were extended and secured by wrapping circumferentially with a roller bandage. All RCR were performed by a single-docking, totally robotic technique using da Vinci Robotic Radiol Oncol 2021 Grosek J et al. / Robotic versus laparoscopic surgery for colorectal cancer 3 Surgical System Xi (Intuitive Surgical System, Sunnyvale, CA, USA). All cases were operated with a dual console system. The robotic cart was docked on the side of the tumour, either on the left or right side of patients. Four 8 mm robotic ports were placed diagonally, lying on an imaginary linear line. Configuration of two-left handed instruments and one right-handed instrument was employed. Additional 12 mm port (Airseal R , Applied Medical, USA) was inserted for the assistant at the patient site. In both left and right sided colectomies primary vascular control with high-tie of the appropriate vessels was obtained at first. After that, a medial to lateral dissection was performed, respecting the avascular embryological planes. 15 After resecting the bowel with tumour, intracorporeal anastomosis was fashioned: side-to-side anastomosis for right and left colectomies, and end-to-end for sigmoid or anterior rectal resections using circular stapling device and the double-stapling technique. Bowel was safely extracted through small Pfannenstiel incision, with wound-protector inserted for protec- tion from faecal or tumour spillage. For laparoscopic resection four or five trocar technique placed in a rhomboid fashion was used. Primary vascular control, followed by medial-to- lateral dissection was used, like already described in robotic technique. The specimen was exteriorised through mini-median incision with wound-protec- tor, and, after resecting the bowel with tumour, the anastomosis was performed. A combination of in- tracorporeal and extracorporeal anastomoses were utilized, as per surgeon’s discretion. The former was performed as previously described for robotic operation. When extracorporeal anastomoses were chosen for right or left colectomies, they were hand sewn (side-to-side or end-to-side for right sided- anastomoses and end-to-end for left-sided anasto- moses) under direct visualizations. Postoperative complications were strati- fied according to the CD classification system. 13 Accordingly severe morbidity was identified when at least CD grade III or more occurred. Anastomotic leak was considered along with all conditions with clinical or radiological features of anasto- motic dehiscence. Hence, it was defined, as per the International study group definition. 16 Conversion was defined as the unplanned change from lapa- roscopy to open procedure or from robotic surgery to either laparoscopic or open approach. Operative time was considered as the time from the first skin incision until the last scar was sutured. Early and frequent mobility was encouraged, and venous thromboembolism prophylaxis was started approx. 12 hours after the operation. Nasogastric tube was removed prior to the end of the operation, while drainage tube and Foley catheter were removed on postoperative day one. Patients were offered clear liquids in the evening on the day of the operation. In the absence of nau- sea, vomiting or abdominal discomfort they were quickly advanced from liquid to regular diet. Statistical analysis Categorical variables were described by frequen- cies and percentages, normally distributed contin- uous variables by means and standard deviations, others by medians and interquartile ranges (IQR). Normality of the distribution of continuous varia- bles per treatment group was assessed by Shapiro- Wilk test. The association between patient charac- teristics, operation duration, conversions, duration of hospitalization, complications, reoperation, and type of operation was assessed by using univariate logistic regression analysis. When there were zero cases present in any of the cells of the contingency table, likelihood ratio test was used. All statistical testing was performed at 0.05 significance level. Statistical program SPSS version 27 was used to perform all statistical analyses. Results There was no statistically significant association between demographic variables, concomitant dis- eases, the severity of disease and the type of the operation (Table 1). Patient characteristics did not differ significantly between groups as there was no statistically significant association between demo- graphic variables, concomitant diseases, and sever- ity of disease and the type of the operation. Associations between several variables of the performed operation, patient course of recovery af- ter the operation, procedure (type of resection) and the type of the operation performed (laparoscopic or robotic) were analysed by univariate logistic regression and results are presented in Table 2. Operative time was statistically significantly long- er (p < 0.001) in robotic group. Five (13.5%) patients had operation conversion within the laparoscopic group, while there were no conversions to open surgery in the robotic group of patients (p = 0.004). While the groups were comparable regarding the duration of hospitalization (p = 0.168) and the number of harvested lymph nodes (p = 0.240), the transfusion was to higher extent given to patients Radiol Oncol 2021 Grosek J et al. / Robotic versus laparoscopic surgery for colorectal cancer 4 in laparoscopic group of patients (p = 0.004). Five (13.5%) patients within laparoscopic group needed transfusion, while there were no patients in need of transfusion within the robotic group of patients. The groups were comparable both with regards to overall complications (p = 0.576) as well as to type of complications according to the CD classifica- tion (p = 0.12). Reoperation was performed in three (8.1%) patients from the laparoscopic and none of the patients within the robotic group of patients (p = 0.026). Discussion This analysis of minimally invasive colorectal re- sections is, to the best of our knowledge, the first comparison of robotic versus laparoscopic resec- tions for colon and upper rectal cancer in Slovenia. Safety of our patients and quality of surgical care was of outmost importance when we implement- ed a new robotic abdominal program. Hence, treatment results were not to be compromised. Consequently, only patients with colon and up- per rectal cancer were operated at first, because we deemed middle and low rectal cancers not suitable at the beginning of the new program, due to techni- cal demands of pelvic surgery. Many studies, comparing RCR and LCR, have shown the new technology to be safe, feasible and at least equivalent with respect to short-term out- comes and oncological results. 17 The most relevant finding of our study were significantly lower rates of conversion to open with the robotic platform compared to LCR (p = 0.004), which is consist- ent with findings of other studies. 18 Only slightly shorter hospital length of stay was seen in robotic group, the difference not reaching statistical sig- nificance (p = 0.168). Some studies agree with our findings, others, on the other hand, demonstrate TABLE 1. Association between demographic characteristics, concomitant diseases, severity of the disease, and type of operation (results of univariate logistic regression) Laparoscopic (n = 37) Robotic (n = 46) OR (95 % CI) P Male gender 23 (62.2) 26 (56.5) 0.79 (0.33; 1.92) 0.604 Mean age (SD) 67.5 (10.1) 66.8 (11) 0.99 (0.95; 1.04) 0.770 Median (IQR) BMI 27.2 (25.1 - 29.4) 27.5 (25.7 - 31.3) 1.01 (0.92; 1.12) 0.808 ASA 0.262 a 1 0 (0) 2 (4.3) 2 20 (54.1) 24 (52.2) 3 16 (43.2) 20 (43.5) 4 1 (2.7) 0 (0) Procedure 0.273 Right colectomy 15 (40.5) 21 (45.7) - - Left colectomy 4 (10.8) 3 (6.5) - - Rectosigmoid/sigmoid/anterior resection 16 (43.2) 22 (47.8) - - Total colectomy 2 (5.4) 0 (0) - - T stage T1 9 (24.3) 7 (15.2) - - T2 7 (18.9) 13 (28.3) 2.39 (0.69;9.2) 0.206 T3 15 (40.5) 20 (43.5) 1.71 (0.52;5.65) 0.376 T4 6 (16.2) 6 (13) 1.29 (0.29;5.77) 0.743 Stage 1 16 (43.2) 12 (26.1) 1 - 2 9 (24.3) 18 (39.1) 2.67 (0.89; 7.98) 0.079 3 12 (32.4) 16 (34.8) 1.78 (0.62; 5.12) 0.287 a = likelihood ratio test; ASA = American Society of Anaesthesiologists score; BMI = body mass index; CI = confidence interval; IQR = interquartile range; OR = odds ratio; SD = standard deviation Radiol Oncol 2021 Grosek J et al. / Robotic versus laparoscopic surgery for colorectal cancer 5 clinically significant shorter length of stay associ- ated with robotic colorectal resections. 19-21 In our study, there were three cases of anastomotic leak- age in laparoscopic group. All three patients had to be reoperated, one of them died due to the septic shock. In the robotic group, there was no anasto- motic leakage, however, one patient died because of acute thrombosis of superior mesenteric artery and coeliac axis. It is reasonable to assume that our study was underpowered to detect differences in postoperative morbidity, either overall or specific complications. However, other studies also dem- onstrate inconsistencies when comparing laparo- scopic and robotic complication rates. Halabi et al., in their analysis argue, that there is no difference in postoperative morbidity between LCR and RCR. 22 On the other hand, there are studies, showing bet- ter results in terms of postoperative morbidity and mortality for either laparoscopic or robotic colorec- tal resections. 23,24 Nevertheless, some reports in lit- erature show variable differences in complication rates, i.e., more anastomotic complications in one group and more general postoperative morbidity in the other. 20 Another limitation of our study is its retrospec- tive observational nature with all the inherent bi- ases. Important issue to be addressed are the op- erative costs, which is one of the biggest criticisms of robotic surgery and has been a subject of discus- sion since its introduction. Our database does not include the cost data, so we did not address this issue in our study. Also, the intention of study be- ing primarily the safety and oncologic equivalency of our new robotic surgical program, we did not assess the quality of life of operated patients. This, together with comprehensive cost analysis as well as long-term oncological results represents a very good potential for future studies. The strength of our study is that the operations were performed by only two surgeons that reduces the heterogeneity of surgical techniques. Both sur- geons had years of experience in laparoscopic sur- gery for all the patients included in the study and it can be assumed that they were already on top of their learning curve in laparoscopic surgery. This probably also played a role in faster acquisition of skills on the robotic platform. However, since the included robotic operations represent the start of our robotic program, there may still be room for improvement. It has been shown that the operat- ing time decreases with the number of cases and this could have impacted the results of our study as well. 25,26 Conclusions With this study, we sought to offer an outcome- based assessment of implemented robotic colorec- tal program at our academic institution. Based on TABLE 2. Association between the operation and hospitalization duration, conversion, number of lymph nodes, transfusion, complications, reoperation, and the type of the operation (results of univariate logistic regression) Laparoscopic (n = 37) Robotic (n = 46) OR (95 % CI) P Median (IQR) operation duration (min) 150 (130–184) 262 (201–300) 1.03 (1.02; 1.05) < 0.001 Conversion 5 (13.5) 0 (0) 0.004 a Median (IQR) hospitalization duration 7 (6–8) 6 (5–7) 0.91 (0.81; 1.04) 0.168 Lymph nodes 20 (15–26) 24 (21–30) 1.03 (0.98; 1.08) 0.24 Transfusion 5 (13.5) 0 (0) 0.004 a Complications 10 (27) 10 (21.7) 0.75 (0.27; 2.06) 0.576 Clavien-Dindo 0.12 a 0 27 (73) 36 (78.3) 1 0 (0) 3 (6.5) 2 7 (18.9) 6 (13) 3 2 (5.4) 0 (0) 5 1 (2.7) 1 (2.2) Reoperation 3 (8.1) 0 (0) 0.026 a a = likelihood ratio test; CI = confidence interval; IQR = interquartile range; OR = odds ratio Radiol Oncol 2021 Grosek J et al. / Robotic versus laparoscopic surgery for colorectal cancer 6 the results, it is appropriate to conclude, that our program is safe, has equivalent postoperative re- sults compared to classic laparoscopy and is even associated with decreased conversion rates. 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