Colon Cancer
Colon Cancer
DOI 10.1007/s00464-012-2592-x
GUIDELINES
Received: 3 May 2012 / Accepted: 11 June 2012 / Published online: 13 December 2012
Ó Springer Science+Business Media New York 2012
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2                                                                                                         Surg Endosc (2013) 27:1–10
    This guideline, written by SAGES, was reviewed and           Table 1 GRADE system for rating the quality of evidence for
approved for endorsement by the Executive Council of the         SAGES guidelines
ASCRS on 23 February 2012.                                       Quality of   Definition            Symbol used
    Colorectal cancer is the fourth most common malignancy       evidence
in the United States and the second most common cause of
                                                                 High         Further research is
death from cancer in this country. In 2006, a total of 139,127    quality      very unlikely to
people were diagnosed with colorectal cancer and 53,196                        alter confidence
people died from it [3]. One of the most controversial issues                  in the estimate
in minimally invasive surgery has been the implementation                      of impact
of laparoscopic techniques for resection of curable colorectal   Moderate     Further research is
                                                                  quality      likely to alter
malignancies. Initial concerns included the potential viola-                   confidence in the
tion of oncologic principles, the effects of carbon dioxide                    estimate of
insufflation, and the phenomenon of port site tumor recur-                     impact and may
rence [4, 5]. Basic science research and large randomized                      change the
                                                                               estimate
controlled trials are now demonstrating that these fears are
                                                                 Low          Further research is
unjustified. The laparoscopic approach, however, involves a       quality      very likely to
steep learning curve and requires the surgeon and ancillary                    alter confidence
operating room staff to have advanced skills in laparoscopy.                   in the estimate
                                                                               of impact and is
                                                                               likely to change
                                                                               the estimate
Definitions                                                      Very low     Any estimate of
                                                                  quality      impact is
                                                                               uncertain
Both the quality of the evidence and the strength of the
recommendation for each of the recommendations below             GRADE recommendations based on the quality of evidence for
were assessed according to the GRADE system [6] (see              SAGES guidelines
Table 1). There is a four-tier system for judging quality of      Strong      It is very certain that benefit exceeds risk for the option
                                                                                considered
evidence [very low (), low (), moderate (), or
                                                                  Weak        Risk and benefit well balanced, patients and providers
high ()] and a two-tier system for determining the                         faced with differing clinical situations likely would
strength of a recommendation (weak or strong). Additional                      make different choices, or benefits available but not
definitions are provided by SAGES in ‘‘The Definitions                         certain regarding the option considered
Document: A Reference for Use of SAGES Guidelines.’’             Adapted from Guyatt et al. [6]
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circumferentially in the colonic wall adjacent to the lesion    from meta-analyses [28, 29] and randomized controlled
to maximize the surgeon’s ability to localize the lesion        trials [30–33]. It should be noted that these studies evalu-
intraoperatively. Transmural injections can result in diffuse   ated the use of MBP for open colorectal surgery. It is
intra-abdominal staining and may predispose to adhesion         unclear if results from these trials can be extrapolated to
formation [17, 19]. If the tumor is not localized preopera-     laparoscopic colorectal surgery. Furthermore, the role of
tively or the preoperative marking cannot be reliably           MBP for open rectal surgery remains controversial, espe-
identified during surgery, intraoperative colonoscopy           cially in low colorectal or coloanal anastomoses since most
should be used [10]. When intraoperative colonoscopy is         trials exclude such patients [28]. This continually evolving
utilized, carbon dioxide insufflation may be preferable as      body of literature suggests that MBP is optional for
its rapid absorption lessens the risk of a persistently dis-    resections of the colon and the upper rectum, but MBP is
tended colon interfering with surgery.                          advised before resections of the lower rectum or when
                                                                proximal diversion is planned after rectal resection and
Diagnostic evaluation for metastases                            anastomosis. The literature suggests that MBP facilitates
                                                                manipulation of the bowel during laparoscopic resection
Recommendation: We recommend that for patients with             and readies the colon for intraoperative colonoscopy when
colon or rectal cancer, the chest, abdomen, and pelvis be       it is required for lesion localization or to assess anasto-
evaluated preoperatively with a CT scan. In patients with       moses [34–36].
rectal cancer, we also recommend preoperative locore-
gional staging with endorectal ultrasound or MRI.
(
, strong).                                                 Surgical technique and operative considerations
   Routine cross-sectional imaging should be used preop-
                                                                Surgical technique: colon
eratively for patients with colon or rectal cancer. Metas-
tases of [1-cm diameter are detected by CT scan, with
                                                                Recommendation:       We recommend that laparoscopic
sensitivities and specificities of 90 and 95 %, respectively
                                                                resection follow standard oncologic principles: proximal
[20]. In the case of rectal cancer, thoracic abdominopelvic
                                                                ligation of the primary arterial supply to the segment har-
staging evaluation should always be conducted preopera-
                                                                boring the cancer, appropriate proximal and distal margins,
tively as the finding of pulmonary, hepatic, or other
                                                                and adequate lymphadenectomy. (, strong).
metastases is likely to change the operative approach
employed and impact overall patient care [21]. In patients          Guidelines established by the 2000 National Cancer
with rectal cancer, locoregional staging also is vital to       Institute (NCI)-sponsored Colon and Rectal Cancer Sur-
preoperative planning; endorectal ultrasound and MRI are        gery Consensus Panel state that the margins of resection for
the most commonly used procedures [22]. A discussion of         colon cancer are determined by the arterial supply feeding
locoregional staging for rectal cancer is beyond the inten-     the affected segment of colon [37]. Proximal ligation of
ded scope of this guideline, but readers are referred to the    vessels supplying tumors, or of multiple feeding vessels
Rectal Cancer Guidelines of the American Society of             when the tumor falls between arterial distributions, should
Colon and Rectal Surgeons [23].                                 result in adequate proximal and distal resection margins.
                                                                Lesions should be excised en bloc with oncologically
                                                                appropriate tumor-free radial margins (R0) to be consid-
Preparation for operation                                       ered curative [38].
                                                                    The five adequately powered randomized trials of lap-
Standard guidelines have been published regarding the           aroscopic colectomy for curable colon cancer [37, 39–42]
safety of outpatient bowel preparation [21, 22], use of         followed these oncologic principles and showed no sig-
prophylactic antibiotics [24], blood cross matching [25,        nificant difference in proximal and distal margins, number
26], and venous thromboembolism prophylaxis [27].               of lymph nodes retrieved, and, in the Clinical Outcomes of
                                                                Surgical Therapy Study Group (COST) trial, perpendicular
Recommendation:         We suggest that preoperative
                                                                length of the primary vascular pedicle [37]. Four of these
mechanical bowel preparation (MBP) be used to facilitate
                                                                trials showed that long-term survival and recurrence were
manipulation of the bowel during the laparoscopic
                                                                no different for patients treated with open surgery versus
approach and to facilitate intraoperative colonoscopy when
                                                                laparoscopic surgery [37, 39, 41–42]. In subgroup analysis,
needed. (
, weak).
                                                                patients enrolled in the Barcelona trial with resectable,
  The use of preoperative MBP is common practice in             node-positive colon cancer, AJCC stage III, who were
North America, despite a lack of clear evidence of benefit      treated using a laparoscopic approach, had improved
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4                                                                                                    Surg Endosc (2013) 27:1–10
overall survival, cancer-related survival, and decreased         margin. In order to ensure a tension-free anastomosis,
recurrence compared with an open approach, although the          vascular ligation should occur either at the takeoff of the
trial was not powered to answer this question [40].              inferior mesenteric artery from the aorta or just distal to the
    Extended lymphadenectomy and the ‘‘no-touch’’ tech-          takeoff of the left colic artery. Despite the use of stan-
nique have not been shown to result in improved survival         dardized surgical techniques and pathology-processing
in open resection [43, 44]. Extended margins of resections       protocols, the number of lymph nodes resected with rectal
have not been shown to confer additional survival benefit        cancers remains variable and may not serve as a useful
[45]. Some surgeons employ a medial-to-lateral approach          indicator of surgical quality [53–55].
with early ligation of the mesenteric vessels [46–48]. No           The confines of the pelvis confer additional challenges
oncologic benefit of this approach has been shown.               when utilizing the laparoscopic approach, particularly for
    Excessive force, the use of instruments not suitable for     distal rectal tumors. The ability to perform an oncologi-
handling the bowel, and other techniques that predispose to      cally adequate resection for rectal cancer laparoscopically
inadvertent perforation [11] should be avoided since per-        will depend on tumor size and location and on anatomical
foration at the tumor site results in increased rates of local   factors like a narrow pelvis, obesity, bulky uterus, and
recurrence and a significant reduction in 5-year survival        the effects of presurgical radiation. Inability to adhere to
[49]. Atraumatic handling of the bowel should be the goal        oncologic principles should prompt conversion to an open
of every surgeon and can be achieved by blunt retraction,        operation provided that conversion will enhance adherence
grasping of the epiploic appendages, and the use of              to established principles. Selection of the anastomotic
atraumatic graspers.                                             method or creation of a temporary or permanent ostomy
    Inability to adhere to all accepted oncologic principles,    should be made in a manner that is identical to making
including appropriate vascular ligation, should prompt           these decisions in patients undergoing laparotomy.
conversion to an open operation if conversion will permit           Several prospective [54–56] and retrospective [57, 58]
adherence to established principles. Careful patient selec-      case series have demonstrated that laparoscopic total
tion, complete preoperative staging, accurate tumor local-       mesorectal excision can be performed safely and ade-
ization, and an experienced surgeon working with an              quately. The mid- and long-term oncological outcomes of
experienced operating room staff all contribute to maxi-         open and laparoscopic approaches appear to be similar. To
mizing patient benefit and minimizing conversion to open         date, only one randomized trial included long-term results
resection [50].                                                  of laparoscopic and open surgical treatments of rectal
    The decision to administer adjuvant therapy is inde-         cancer. The UK MRC-CLASSIC Trial Group found no
pendent of the technique used for colon resection and            difference in overall survival, disease-free survival, local
should mirror recommendations for open resection                 recurrence, wound recurrence, or quality of life between
[51, 52].                                                        the two approaches [59, 60]. Thirty-four percent of the
                                                                 patients randomized to the laparoscopic group underwent
                                                                 conversion to an open procedure and this cohort had
Surgical technique: rectum
                                                                 a higher incidence of postoperative complications (p =
                                                                 0.002) and worsened overall survival but equivalent dis-
Recommendation:       We recommend that laparoscopic
                                                                 ease-free survival at 5 years [60]. Furthermore, in patients
resection for rectal cancer follow standard oncologic
                                                                 who underwent laparoscopic low anterior resection, there
principles: Adequate distal margin, ligation at the origin of
                                                                 was a higher rate of positive circumferential margins,
the arterial supply for the involved rectal segment, and
                                                                 although this did not impact local recurrence or survival
mesorectal excision. (
, strong).
                                                                 [59]. Overall, male sexual and erectile function was worse
   Resection of very low rectal cancers, intersphincteric        in the laparoscopic group [61].
resection, and other sphincter-sparing techniques are               The COREAN trial randomized 340 patients with
beyond the intended scope of this guideline, but readers are     T3N0-2 mid or low rectal cancers, \9 cm from the anal
referred to the Rectal Cancer Guidelines of the ASCRSs           verge, to undergo laparoscopic or open surgery following
[23].                                                            neoadjuvant chemoradiation treatment [62]. The primary
   Operative guidelines for open rectal surgery have been        end point was 3-year disease-free survival. Patients were
established, with levels of evidence and grades of recom-        treated by seven surgeons experienced in laparoscopic
mendation for techniques relevant only to the rectum [38,        colorectal surgery at three institutions. Their short-term
53]. Malignant lesions of the upper rectum should be             outcomes demonstrated less blood loss in the laparoscopic
resected with 5-cm minimum distal margins, while lesions         group (200 vs. 217.5 ml, p = 0.006), albeit with a longer
of the middle and lower rectum require total mesorectal          operating time (244.9 vs. 197 min, p \ 0.0001). Involve-
resection, including an oncologically appropriate distal         ment of the circumferential margin, macroscopic quality of
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the total mesorectal excision specimen, number of har-          initial laparoscopy, the goals of surgery may shift from
vested lymph nodes, and perioperative morbidity did not         curative to palliative. To date, there have been no ran-
differ between the groups. Conversion rate to open resec-       domized trials comparing laparoscopic and open approa-
tion was only 1.2 %. Three months following the proc-           ches to T4 colonic or rectal cancer.
tectomy, or ileostomy reversal if one was used, the
laparoscopic group had better quality-of-life scores when       Obstructing colon cancer
physical function, fatigue, micturition, and gastrointestinal
function were assessed. The COLOR II, Japanese JCOG             Recommendation: We recommend that patients with an
0404, and ACOSOG Z6051 trials are other randomized              obstructing right or transverse colon cancer undergo a right
controlled trials currently underway that seek to compare       or an extended right colectomy. The open approach is
laparoscopic and open surgery for rectal cancer, assessing      required if the laparoscopic approach will not result in an
morbidity and long-term oncological outcome [62–65].            oncologically sound resection. (
, strong).
   The decision to offer adjuvant or neoadjuvant chemo-
                                                                   Patients with an obstructing right or transverse colon
radiation should be based on tumor- and patient-specific
                                                                cancer should undergo a right or an extended right colec-
factors and not on the surgical approach. The optimal
                                                                tomy with primary ileocolic anastomosis in the appropriate
timing of surgery for rectal cancer following neoadjuvant
                                                                clinical setting. Performing an anastomosis and/or the
therapy has been examined in several trials, and although it
                                                                creation of a diverting stoma is dependent on the patient’s
is still debated, it should not be altered based on the
                                                                general condition. Multiple nonrandomized studies have
technique chosen for resection [66–68]. A complete dis-
                                                                demonstrated that a primary anastomosis is safe in the
cussion of adjunctive treatment is beyond the intended
                                                                absence of MBP [73, 74]. The decision to proceed lapa-
scope of this guideline, but readers are referred to the
                                                                roscopically should take into account the patient’s condi-
Rectal Cancer Guidelines of the ASCRSs [23].
                                                                tion, including hemodynamic stability, extent of abdominal
                                                                distension, the resectability of the carcinoma, and the sur-
Locally advanced adherent colon and rectal tumors
                                                                geon’s ability to perform a curative resection in this setting.
                                                                Although there have been some retrospective studies
Recommendation: For locally advanced adherent colon
                                                                demonstrating feasibility of laparoscopic resection with
and rectal tumors, an en bloc resection is recommended.
                                                                benefits in short-term outcomes [75, 76], a prospective
We suggest an open approach if a laparoscopic en bloc
                                                                randomized controlled trial has not yet been published.
resection cannot be performed adequately. (
,
weak).                                                          Recommendation: We suggest that for patients with an
                                                                obstructing left-sided colon cancer, the procedure be indi-
   Up to 15 % of patients with colon cancer and 5–12 % of
                                                                vidualized according to clinical factors. Colonic stenting
patients with rectal cancer will have tumors adherent to
                                                                may increase the likelihood of completing a one-stage
adjacent organs [69–71]. Current guidelines for open colon
                                                                procedure and may decrease the likelihood of an end
and rectal cancer surgery recommend en bloc resection
                                                                colostomy. (
, weak).
to manage locally advanced adherent colorectal tumors
[9, 38]. Histologically negative margins achieved with en          For patients who present with an obstructing cancer of
bloc resection are considered curative. Preoperative cross-     the left colon, a variety of options have been advocated [77,
sectional imaging, including CT scan, MRI, or ultrasound,       78]. The most frequently used are resection with end
might suggest a bulky tumor invading into adjacent struc-       colostomy and Hartmann’s pouch, resection with on-table
tures, guiding the decision to perform an open resection        lavage and primary anastomosis with or without diverting
[72]. The ability to perform en bloc resection laparoscop-      ostomy, and subtotal colectomy with ileorectal anastomo-
ically is dependent on the structure to which the tumor is      sis. More recently, colonic stenting in appropriately
adherent and the surgeon’s skill and experience. When the       selected patients may obviate obstruction, permitting
goal is curative resection, intraoperative discovery of a T4    colonic decompression and elective resection with primary
lesion often requires conversion, unless the surgeon is able    anastomosis, decreasing the rate of colostomy creation in
to effectively resect the lesion en bloc. However, en bloc      this setting. One randomized controlled trial compared
resection might not be possible using either technique, and     endoluminal stenting followed by laparoscopic resection to
therefore the surgeon must decide if conversion is likely to    immediate open surgical resection of obstructing left-sided
afford curative resection. Occasionally, laparoscopy may        colon cancers [79]. The authors found that more patients in
become diagnostic, with closure followed by reimaging           the stenting and laparoscopic resection group underwent
and multidisciplinary consultation prior to a definitive        one-stage operations (66 vs. 37.5 %; p = 0.04) and that no
resection at a later date. In some situations, based on the     patients in this group required colostomy, compared with
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6                                                                                                      Surg Endosc (2013) 27:1–10
25 % of patients in the open surgery group who received           spaces, and fixed instrument tips. Moreover, the robotic
end colostomy.                                                    system provides excellent ergonomics, tremor stabilization,
                                                                  enhanced ambidextrous capability, motion scaling, and
                                                                  instruments capable of moving with multiple degrees of
Prevention of wound complications                                 freedom. Robotic surgery has the drawbacks of diminished
                                                                  haptic feedback, increased operative times, and increased
Recommendation: The use of a wound protector at the               procedural cost. Large-scale prospective randomized trials
extraction site and the irrigation of port sites and extraction   will be required to evaluate long-term clinical outcomes of
site incisions may reduce abdominal wall cancer recur-            robotic surgery and to identify actual clinical benefit.
rences. (
, strong).
   Wound implants, or abdominal wall cancer recurrences,          Training and experience
have been reported at both extraction site and port site
incisions [4, 37, 39, 59, 80], prompting extensive research       Recommendation:      Before surgeons apply the laparo-
[81–90] and initially calling the oncologic safety of the         scopic approach for the resection of curable colon and
laparoscopic approach into question [91].                         rectal cancer, they must have adequate knowledge, train-
   It is now accepted that port-site recurrence is a technical    ing, and experience in laparoscopic techniques and onco-
complication of laparoscopic colectomy and not an inevi-          logic principles. (
, strong).
table consequence of the laparoscopic approach. Several
                                                                     Some reviewed studies mandated a minimum of 20 lapa-
large case series and randomized trials comparing laparo-
                                                                  roscopic colon cancer operations for surgeon inclusion into
scopic versus open colectomy for colon carcinoma have
                                                                  clinical trials [37, 38], whereas studies examining the learning
confirmed port-site recurrences well below 1 % [37, 39, 59,
                                                                  curve for laparoscopic colectomy have suggested that at least
92–94]. This is similar to the rate of incisional recurrence
                                                                  50 cases are required to gain proficiency [116–118].
noted after open colorectal cancer resection [39, 94, 95].
                                                                  Advanced laparoscopic training during residency or fellow-
   In a consensus report from the European Association of
                                                                  ship and training on simulators may shorten the learning curve
Endoscopic Surgeons, Veldkamp et al. [72] collected all
                                                                  toward proficiency. Surgeons must carefully observe the
reported cases of port-site recurrences from a total of 28
                                                                  principles applicable to resection of colon and rectal cancers to
different studies from Europe, Asia, Australia, and North
                                                                  have long-term outcomes similar to those of open resections.
America. There were 38 overall port-site recurrences on a
                                                                  Mentoring, proctoring, and working with an experienced
denominator of 5,225 combined patients, corresponding to
                                                                  assistant have each been shown to be effective in the adoption
an overall incidence of 0.72 %.
                                                                  of techniques new to a surgeon’s skill set [119].
   Most surgeons performing laparoscopic colectomy use
wound protectors to isolate specimens from contact with the
abdominal wall [72]. Irrigation of the port site with a variety   Summary of recommendations
of tumoricidal solutions reduces tumor implants in animal
models, but there is no consensus on the ideal irrigant or        Tumor localization
whether this laboratory observation holds value in the per-
formance of colon cancer resections in humans [96–101].           Recommendation:         When approaching colon resection
                                                                  laparoscopically, every effort should be made to localize
                                                                  the tumor preoperatively. Small lesions should be marked
Robotic surgery                                                   endoscopically with permanent tattoos before surgery to
                                                                  maximize the surgeon’s ability to identify the lesion. Sur-
Recommendation: While robotic surgery for colon and               geons should be prepared to use colonoscopy intraopera-
rectal cancer appears feasible and safe, in the absence of        tively if lesion localization is uncertain. (
, strong).
long-term oncologic outcome studies, no clear recom-
mendation can be made. (
, weak).                              Diagnostic evaluation for metastases
   Case reports suggest that the use of robotics is feasible
and safe in selected patients with colon and rectal cancer        Recommendation: We recommend that for patients with
[102–115]. Robotic devices were developed to overcome             colon or rectal cancer, the chest, abdomen, and pelvis be
the disadvantages of conventional laparoscopic surgery,           evaluated preoperatively with CT scan. In patients with
such as an assistant-dependent unstable camera platform,          rectal cancer, we also recommend preoperative locore-
two-dimensional view, limited dexterity associated with           gional staging with endorectal ultrasound or MRI.
the use of traditional laparoscopic instruments in confined       (
, strong).
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Surg Endosc (2013) 27:1–10                                                                                                            7
Recommendation: We suggest that preoperative MBP be                Recommendation: While robotic surgery for colon and
used to facilitate manipulation of the bowel during the            rectal cancer appears feasible and safe, in the absence of
laparoscopic approach and to facilitate intraoperative             long-term oncologic outcome studies, no clear recom-
colonoscopy when needed. (
, weak).                             mendation can be made. (
, weak).
Recommendation:       We recommend that laparoscopic               Recommendation:       Before surgeons apply the laparo-
resection follow standard oncologic principles: proximal           scopic approach for resection of curable colon and rectal
ligation of the primary arterial supply to the segment har-        cancer, they must have adequate knowledge, training, and
boring the cancer, appropriate proximal and distal margins,        experience in laparoscopic techniques and oncologic prin-
and adequate lymphadenectomy. (, strong).                      ciples. (
, strong).
                                                                                                                            123
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